Theo Robinson punished two defensive blunders by 10-man Oldham to give Huddersfield's play-off hopes a boost.
Oldham dominated as former Terriers striker Pawel Abbott headed against the crossbar in the first half.
But Robinson opened the scoring when Reuben Hazell's headed clearance hit team-mate Dale Stephens and fell kindly for Robinson, who finished neatly.
Robinson sealed victory in injury time as Oldham were caught on the break to allow Gary Roberts to set up Robinson.
Huddersfield Town manager Lee Clark told BBC Radio Leeds: "You said I've got a big grin - I think it's more of an embarrassed smile, because we've won two-nil, and it's all about winning but God only knows how.
"That was if not our worst home performance then up there with them, without a shadow of a doubt.
"It was flat, we didn't do many things right, if anything, but we scored two goals and maybe could have got a couple more. But we've got to make sure the players are aware that we've got to perform better than that."
90:00+5:20 The referee brings the game to a close.
Full Time
90:00+5:05 Shot by Theo Robinson (Huddersfield) right-footed from left side of penalty area (18 yards), save (parried) by Darryl Flahavan (Oldham).
90:00+4:11 Shot by Tom Eaves (Oldham) right-footed from left channel (25 yards), missed left. Goal kick taken long by Alex Smithies (Huddersfield).
90:00+3:48 Attacking throw-in by Paul Black (Oldham).
90:00+2:28 Assist (cross) by Gary Roberts (Huddersfield) from right wing.
90:00+2:28 GOAL - Theo Robinson:Huddersfield 2 - 0 Oldham Goal by Theo Robinson (Huddersfield) right-footed (bottom-right of goal) from centre of penalty area (12 yards).Huddersfield 2-0 Oldham.
90:00+1:58 Attacking throw-in by Reuben Hazell (Oldham).
90:00+1:14 Outswinging corner from right by-line taken right-footed by Dale Stephens (Oldham) to far post, clearance by James Berrett (Huddersfield).
90:00+0:29 Foul by Gary Roberts (Huddersfield) on Reuben Hazell (Oldham). Free kick crossed right-footed by Dale Stephens (Oldham) from right wing, resulting in open play.
90:00+0:03 Attacking throw-in by Reuben Hazell (Oldham).
89:20 Defending throw-in by Dean Heffernan (Huddersfield).
89:20 Substitution Oldham substitution: Dean Furman replaced by Alex Marrow (tactical).
86:12 Defending throw-in by Dean Heffernan (Huddersfield).
85:58 Attacking throw-in by Reuben Hazell (Oldham).
85:05 Attacking throw-in by Reuben Hazell (Oldham).
84:14 Attacking throw-in by Paul Black (Oldham).
83:50 Defending throw-in by Lee Peltier (Huddersfield).
83:05 Attacking throw-in by Lee Peltier (Huddersfield).
83:01 Booking Alex Smithies (Huddersfield) booked for time wasting.
82:12 Goal kick taken long by Alex Smithies (Huddersfield).
81:47 Defending throw-in by Paul Black (Oldham).
81:03 Goal kick taken long by Darryl Flahavan (Oldham).
81:03 Substitution Oldham substitution: Pawel Abbott replaced by Joe Colbeck (tactical).
80:44 Shot by Theo Robinson (Huddersfield) right-footed from left side of penalty area (18 yards), over the bar.
80:19 Header by Peter Clarke (Huddersfield) from left side of six-yard box (6 yards), comfortable save (caught) by Darryl Flahavan (Oldham).
79:44 Inswinging corner from right by-line taken left-footed by Gary Roberts (Huddersfield) to near post, clearance by Dale Stephens (Oldham).
79:11 Free kick taken right-footed by Peter Clarke (Huddersfield) from own half, resulting in open play.
79:11 Substitution Oldham substitution: Chris Taylor replaced by Tom Eaves (tactical).
79:01 Lewis Guy (Oldham) caught offside.
78:00 Attacking throw-in by Dean Heffernan (Huddersfield).
76:49 Attacking throw-in by Danny Whitaker (Oldham). Attacking throw-in by Danny Whitaker (Oldham).
76:29 Foul by Daniel Drinkwater (Huddersfield) on Dale Stephens (Oldham). Free kick taken right-footed by Sean Gregan (Oldham) from own half, resulting in open play.
76:00 Shot by Gary Roberts (Huddersfield) left-footed from right side of penalty area (18 yards), save (parried) by Darryl Flahavan (Oldham).
75:06 Free kick taken left-footed by Dean Heffernan (Huddersfield) from own half, resulting in open play.
75:06 Substitution Huddersfield substitution: Anthony Pilkington replaced by Nathan Eccleston (injury).
74:44 Sent off Kieran Lee (Oldham) dismissed for second bookable offence.
74:26 Foul by Kieran Lee (Oldham) on Dean Heffernan (Huddersfield).
71:58 Goal kick taken long by Alex Smithies (Huddersfield).
71:27 Foul by Peter Clarke (Huddersfield) on Pawel Abbott (Oldham). Free kick taken right-footed by Pawel Abbott (Oldham) from right channel, passed.
70:44 Lewis Guy (Oldham) caught offside. Free kick taken right-footed by Alex Smithies (Huddersfield) from own half, resulting in open play.
70:20 Foul by Tom Clarke (Huddersfield) on Dale Stephens (Oldham). Free kick taken right-footed by Sean Gregan (Oldham) from own half, passed.
69:25 Defending throw-in by Dean Heffernan (Huddersfield).
68:56 Defending throw-in by Dean Heffernan (Huddersfield).
68:04 Gary Roberts (Huddersfield) caught offside. Free kick taken right-footed by Darryl Flahavan (Oldham) from own half, resulting in open play.
67:57 Attacking throw-in by Gary Roberts (Huddersfield).
67:18 Goal kick taken long by Darryl Flahavan (Oldham).
67:18 Substitution Huddersfield substitution: Michael Collins replaced by James Berrett (tactical).
66:16 Lewis Guy (Oldham) caught offside. Free kick taken right-footed by Peter Clarke (Huddersfield) from own half, resulting in open play.
65:18 Attacking throw-in by Kieran Lee (Oldham).
64:46 Foul by Lee Peltier (Huddersfield) on Chris Taylor (Oldham). Free kick taken right-footed by Sean Gregan (Oldham) from own half, resulting in open play.
64:00 Goal kick taken long by Darryl Flahavan (Oldham).
63:03 Defending throw-in by Dean Heffernan (Huddersfield).
62:49 Defending throw-in by Dean Heffernan (Huddersfield).
62:36 Defending throw-in by Kieran Lee (Oldham).
62:18 Defending throw-in by Kieran Lee (Oldham).
61:27 Substitution Huddersfield substitution: Jordan Rhodes replaced by Tom Clarke (tactical).
61:19 Defending throw-in by Kieran Lee (Oldham).
60:56 Foul by Sean Gregan (Oldham) on Anthony Pilkington (Huddersfield). Free kick taken right-footed by Daniel Drinkwater (Huddersfield) from right channel, resulting in open play.
59:36 Goal kick taken long by Darryl Flahavan (Oldham).
59:18 Attacking throw-in by Anthony Pilkington (Huddersfield).
58:19 Attacking throw-in by Kieran Lee (Oldham).
57:49 Goal kick taken long by Alex Smithies (Huddersfield).
56:52 Goal kick taken long by Alex Smithies (Huddersfield).
56:26 Theo Robinson (Huddersfield) caught offside. Free kick taken right-footed by Sean Gregan (Oldham) from own half, passed.
56:07 Defending throw-in by Dean Heffernan (Huddersfield).
54:59 Free kick taken right-footed by Peter Clarke (Huddersfield) from own half, resulting in open play.
54:59 Booking Kieran Lee (Oldham) booked for unsporting behaviour.
54:45 Foul by Kieran Lee (Oldham) on Gary Roberts (Huddersfield).
54:26 Attacking throw-in by Kieran Lee (Oldham).
53:37 Foul by Peter Clarke (Huddersfield) on Pawel Abbott (Oldham). Free kick taken right-footed by Reuben Hazell (Oldham) from left channel, passed.
52:44 Attacking throw-in by Paul Black (Oldham).
52:08 Defending throw-in by Dean Heffernan (Huddersfield).
51:59 Attacking throw-in by Lewis Guy (Oldham).
51:44 Defending throw-in by Kieran Lee (Oldham).
50:32 Defending throw-in by Paul Black (Oldham).
49:29 Attacking throw-in by Dean Heffernan (Huddersfield).
48:39 Defending throw-in by Lee Peltier (Huddersfield).
47:18 Defending throw-in by Kieran Lee (Oldham).
46:59 Attacking throw-in by Lee Peltier (Huddersfield).
46:35 Attacking throw-in by Dean Heffernan (Huddersfield).
46:01 Defending throw-in by Dean Heffernan (Huddersfield).
45:46 Defending throw-in by Dean Heffernan (Huddersfield).
45:06 Defending throw-in by Lee Peltier (Huddersfield).
45:01 The referee starts the second half.
45:00+2:02 It is the end of the first-half.
Half Time
45:00+1:37 Attacking throw-in by Lee Peltier (Huddersfield).
45:00+0:27 Goal kick taken long by Darryl Flahavan (Oldham).
43:36 Attacking throw-in by Kieran Lee (Oldham).
43:25 Defending throw-in by Kieran Lee (Oldham).
41:11 Shot by Danny Whitaker (Oldham) drilled left-footed from right channel (25 yards), missed left. Goal kick taken long by Alex Smithies (Huddersfield).
39:55 Danny Whitaker (Oldham) caught offside. Free kick taken right-footed by Alex Smithies (Huddersfield) from own half, resulting in open play.
37:46 GOAL - Theo Robinson:Huddersfield 1 - 0 Oldham Goal by Theo Robinson (Huddersfield) lobbed right-footed (bottom-right of goal) from left side of penalty area (12 yards).Huddersfield 1-0 Oldham.
37:31 Attacking throw-in by Dean Heffernan (Huddersfield).
36:46 Foul by Dean Furman (Oldham) on Michael Collins (Huddersfield). Free kick taken left-footed by Dean Heffernan (Huddersfield) from own half, resulting in open play.
35:52 Shot by Danny Whitaker (Oldham) right-footed from left side of penalty area (18 yards), over the bar. Goal kick taken long by Alex Smithies (Huddersfield).
34:15 Attacking throw-in by Kieran Lee (Oldham). Attacking throw-in by Kieran Lee (Oldham).
33:11 Attacking throw-in by Lee Peltier (Huddersfield).
33:00 Goal kick taken long by Alex Smithies (Huddersfield).
32:14 Foul by Peter Clarke (Huddersfield) on Pawel Abbott (Oldham). Free kick taken right-footed by Reuben Hazell (Oldham) from right channel, passed.
31:18 Defending throw-in by Neal Trotman (Huddersfield).
30:09 Outswinging corner from right by-line taken right-footed by Dale Stephens (Oldham) to far post, header by Reuben Hazell (Oldham) from left side of penalty area (12 yards), comfortable save (caught) by Alex Smithies (Huddersfield).
29:17 Foul by Lee Peltier (Huddersfield) on Chris Taylor (Oldham). Free kick taken left-footed by Paul Black (Oldham) from left wing, passed.
28:45 Attacking throw-in by Kieran Lee (Oldham).
28:34 Attacking throw-in by Kieran Lee (Oldham).
27:04 Foul by Daniel Drinkwater (Huddersfield) on Dean Furman (Oldham). Free kick taken right-footed by Reuben Hazell (Oldham) from own half, resulting in open play.
26:45 Attacking throw-in by Dean Heffernan (Huddersfield).
26:28 Defending throw-in by Dean Heffernan (Huddersfield).
25:22 Outswinging corner from right by-line taken right-footed by Dale Stephens (Oldham) to far post, clearance by Anthony Pilkington (Huddersfield).
24:49 Attacking throw-in by Lee Peltier (Huddersfield).
23:03 Lewis Guy (Oldham) caught offside. Free kick taken right-footed by Alex Smithies (Huddersfield) from own half, resulting in open play.
22:30 Attacking throw-in by Paul Black (Oldham).
22:11 Defending throw-in by Lee Peltier (Huddersfield).
21:29 Attacking throw-in by Kieran Lee (Oldham).
20:59 Defending throw-in by Paul Black (Oldham).
20:43 Attacking throw-in by Lee Peltier (Huddersfield).
19:27 Foul by Dean Heffernan (Huddersfield) on Kieran Lee (Oldham). Free kick taken right-footed by Dale Stephens (Oldham) from right wing, header by Pawel Abbott (Oldham) from centre of penalty area (12 yards),
18:38 Attacking throw-in by Lee Peltier (Huddersfield).
18:11 Shot by Pawel Abbott (Oldham) right-footed from right side of penalty area (18 yards), comfortable save (caught) by Alex Smithies (Huddersfield).
17:40 Jordan Rhodes (Huddersfield) caught offside. Free kick taken right-footed by Sean Gregan (Oldham) from own half, resulting in open play.
16:34 Theo Robinson (Huddersfield) caught offside. Free kick taken right-footed by Darryl Flahavan (Oldham) from own half, resulting in open play.
15:52 Defending throw-in by Kieran Lee (Oldham).
14:43 Outswinging corner from right by-line taken right-footed by Anthony Pilkington (Huddersfield) to far post, foul by Theo Robinson (Huddersfield) on Darryl Flahavan (Oldham). Free kick taken right-footed by Darryl Flahavan (Oldham) from own half, resulting in open play.
14:05 Outswinging corner from right by-line taken right-footed by Dale Stephens (Oldham) to far post, header by Reuben Hazell (Oldham) from left side of penalty area (12 yards), comfortable save (caught) by Alex Smithies (Huddersfield).
13:48 Attacking throw-in by Kieran Lee (Oldham).
13:22 Foul by Jordan Rhodes (Huddersfield) on Reuben Hazell (Oldham). Free kick taken right-footed by Reuben Hazell (Oldham) from own half, resulting in open play.
12:52 Goal kick taken long by Alex Smithies (Huddersfield).
12:02 Defending throw-in by Dean Heffernan (Huddersfield).
11:46 Attacking throw-in by Paul Black (Oldham).
11:18 Defending throw-in by Lee Peltier (Huddersfield).
10:22 Foul by Dean Heffernan (Huddersfield) on Lewis Guy (Oldham). Free kick crossed right-footed by Dale Stephens (Oldham) from right channel, clearance by Jordan Rhodes (Huddersfield).
9:47 Attacking throw-in by Paul Black (Oldham).
8:55 Attacking throw-in by Kieran Lee (Oldham).
8:37 Defending throw-in by Kieran Lee (Oldham).
8:04 Attacking throw-in by Paul Black (Oldham).
7:42 Attacking throw-in by Paul Black (Oldham).
7:00 Foul by Gary Roberts (Huddersfield) on Paul Black (Oldham). Free kick taken right-footed by Darryl Flahavan (Oldham) from own half, resulting in open play.
6:17 Inswinging corner from right by-line taken left-footed by Gary Roberts (Huddersfield) to near post, clearance by Sean Gregan (Oldham).
6:03 Defending throw-in by Paul Black (Oldham).
5:25 Defending throw-in by Kieran Lee (Oldham).
4:52 Header by Lewis Guy (Oldham) from centre of penalty area (12 yards), over the bar. Goal kick taken long by Alex Smithies (Huddersfield).
4:17 Attacking throw-in by Kieran Lee (Oldham).
3:34 Pawel Abbott (Oldham) caught offside. Free kick taken right-footed by Peter Clarke (Huddersfield) from own half, passed.
3:08 Defending throw-in by Paul Black (Oldham).
2:25 Goal kick taken long by Alex Smithies (Huddersfield).
1:03 Inswinging corner from left by-line taken right-footed by Anthony Pilkington (Huddersfield) to far post, save (punched) by Darryl Flahavan (Oldham).
0:40 Attacking throw-in by Kieran Lee (Oldham).
0:18 Defending throw-in by Kieran Lee (Oldham).
0:02 Defending throw-in by Kieran Lee (Oldham).
0:00 The referee starts the match.
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