Neil Kilkenny and Luciano Becchio were on target as leaders Leeds notched their fifth straight league win.
Ex-Oldham favourite Kilkenny opened the scoring when he burst into the six-yard box to bundle in Max Gradel's cross.
Leeds had several chances to increase their lead but Oldham keeper Darryl Flahavan kept his side in the game with a string of fine saves.
Argentine Becchio sealed the win late on when he latched on to Gadel's astute pass and finished neatly from 10 yards.
Leeds United manager Simon Grayson told BBC Radio Leeds:
"It was a good victory for us - a clean sheet and two goals in an away performance.
"For the first 20 minutes we were a little bit under the cosh and didn't play as well as we could but we got the goal and looked very positive from then on.
"We looked an accomplished team - we worked hard and on another night we should have been three or four up."
90:00+2:55 The referee blows his whistle to end the game.
89:55 Free kick taken by Neil Kilkenny.
89:55 Substitution Dale Stephens replaces Dean Furman.
89:55 Robert Snodgrass fouled by Dean Furman, the ref awards a free kick.
88:53 Inswinging corner taken left-footed by Robert Snodgrass from the right by-line, Sean Gregan manages to make a clearance.
87:40 The assistant referee flags for offside against Mike Grella. Darryl Flahavan takes the free kick.
85:57 Substitution Nick Blackman is brought on as a substitute for Keigan Parker.
85:57 Substitution Mike Grella on for Max Gradel.
81:35 Max Gradel provided the assist for the goal.
81:35 GOAL - Luciano Becchio:Oldham 0 - 2 Leeds United Luciano Becchio grabs a goal from inside the penalty box to the bottom left corner of the goal. Oldham 0-2 Leeds.
80:11 Dean Furman has an effort at goal from outside the box which goes wide right of the target.
78:43 Robert Snodgrass takes a shot. Darryl Flahavan makes a brilliant save.
78:09 Keigan Parker gives away a free kick for an unfair challenge on Tony Capaldi. Casper Ankergren takes the free kick.
76:38 Substitution Ryan Brooke comes on in place of Deane Smalley.
76:12 Substitution Sam Vokes leaves the field to be replaced by Luciano Becchio.
72:58 Darryl Flahavan restarts play with the free kick.
72:58 Substitution Robert Snodgrass replaces Hogan Ephraim.
72:58 The offside flag is raised against David Prutton.
70:45 Effort on goal by Paul Black from outside the penalty box goes harmlessly over the bar.
68:22 Paul Heffernan has an effort from just inside the box that misses to the left of the goal.
66:09 Keigan Parker is flagged offside by the assistant referee. Casper Ankergren restarts play with the free kick.
64:04 Dean Furman challenges Max Gradel unfairly and gives away a free kick. Free kick crossed right-footed by Hogan Ephraim from left wing, save made by Darryl Flahavan.
62:42 Joe Colbeck fouled by Jason Crowe, the ref awards a free kick. The ball is crossed by Danny Whitaker, Joe Colbeck has a headed effort at goal from just inside the area that misses to the right of the goal.
58:53 Corner taken by Max Gradel, Sam Vokes produces a right-footed shot from close range that goes over the bar.
58:29 Corner from the left by-line taken by Max Gradel, clearance by Paul Black.
57:39 The free kick is swung in right-footed by Hogan Ephraim, clearance made by Kelvin Lomax.
57:39 Booking Paul Black goes into the book.
57:30 Max Gradel fouled by Paul Black, the ref awards a free kick.
56:44 Free kick awarded for a foul by Max Gradel on Kelvin Lomax. Free kick crossed right-footed by Kelvin Lomax, clearance by Jonathan Howson.
54:04 A cross is delivered by Kelvin Lomax, free kick awarded for a foul by Danny Whitaker on Jonathan Howson. Casper Ankergren restarts play with the free kick.
53:05 Sam Vokes is ruled offside. Direct free kick taken by Alex Marrow.
52:21 Hogan Ephraim sends in a cross, Header from deep inside the area by David Prutton goes over the bar.
50:54 Unfair challenge on Sean Gregan by Neil Kilkenny results in a free kick. Danny Whitaker takes the direct free kick.
50:05 The ball is sent over by Keigan Parker.
48:39 Centre by David Prutton, save by Darryl Flahavan.
47:59 Foul by Neil Kilkenny on Deane Smalley, free kick awarded. Direct free kick taken by Darryl Flahavan.
47:51 The ball is crossed by Hogan Ephraim, clearance by Sean Gregan.
46:55 Sam Vokes takes a shot. Save by Darryl Flahavan.
45:01 The referee gets the second half started.
Half Time
45:00+1:04 The ref blows to end the first period.
44:16 The ball is sent over by David Prutton.
43:42 Outswinging corner taken right-footed by Max Gradel from the right by-line to the near post, Danny Whitaker makes a clearance.
43:32 David Prutton crosses the ball, Paul Black gets a block in.
42:36 Neil Kilkenny restarts play with the free kick.
42:36 Booking Alex Marrow receives a yellow card for unsporting behaviour.
42:27 Unfair challenge on Hogan Ephraim by Alex Marrow results in a free kick.
41:00 Neil Kilkenny has shot on goal from just outside the penalty box which goes wide of the right-hand upright.
38:33 Max Gradel takes a shot. Save by Darryl Flahavan.
36:54 The assist for the goal came from Max Gradel.
36:54 GOAL - Neil Kilkenny:Oldham 0 - 1 Leeds United Goal scored by Neil Kilkenny from close range to the bottom right corner of the goal. Oldham 0-1 Leeds.
36:51 Centre by Max Gradel,
35:55 A cross is delivered by Jason Crowe, Hogan Ephraim challenges Kelvin Lomax unfairly and gives away a free kick. Darryl Flahavan takes the direct free kick.
34:25 A cross is delivered by Kelvin Lomax, clearance by Leigh Bromby.
Correction - 33:17 Max Gradel is ruled offside. Indirect free kick taken by Darryl Flahavan.
33:17 The assistant referee signals for offside against Max Gradel. Direct free kick taken by Darryl Flahavan.
32:12 Sean Gregan concedes a free kick for a foul on Max Gradel. Direct free kick taken by Jason Crowe.
30:25 Sam Vokes takes a shot. Save made by Darryl Flahavan.
29:32 Max Gradel takes the inswinging corner, Deane Smalley manages to make a clearance.
28:55 Hogan Ephraim fouled by Dean Furman, the ref awards a free kick. Free kick crossed right-footed by Hogan Ephraim, clearance by Deane Smalley.
Correction - 27:12 The referee blows for offside. Darryl Flahavan restarts play with the free kick.
27:12 The offside flag is raised against Leigh Bromby. Free kick taken by Darryl Flahavan.
26:36 Inswinging corner taken left-footed by Danny Whitaker from the left by-line, Leigh Bromby makes a clearance.
25:57 Alex Marrow fouled by Max Gradel, the ref awards a free kick. Darryl Flahavan takes the direct free kick.
24:50 Neil Kilkenny challenges Paul Heffernan unfairly and gives away a free kick. Darryl Flahavan restarts play with the free kick.
24:14 The ball is delivered by Hogan Ephraim, blocked by Kelvin Lomax.
22:27 Lubomir Michalik is adjudged to have handled the ball. Danny Whitaker crosses the ball from the free kick right-footed from left wing, clearance by Lubomir Michalik.
Correction - 20:36 Effort on goal by David Prutton from long range goes harmlessly over the bar.
20:36 Danny Whitaker produces a right-footed effort from long distance that goes harmlessly over the bar.
20:09 Inswinging corner taken right-footed by Max Gradel from the left by-line to the near post, Paul Black manages to make a clearance.
17:03 The ball is swung over by Joe Colbeck.
15:07 A cross is delivered by Paul Heffernan, blocked by Leigh Bromby.
14:22 Effort from the edge of the box by Jason Crowe goes wide of the left-hand upright.
13:15 The ball is swung over by Joe Colbeck, clearance made by Lubomir Michalik.
12:54 The assistant referee flags for offside against Sam Vokes. Darryl Flahavan takes the free kick.
11:58 The official flags David Prutton offside. Free kick taken by Sean Gregan.
9:16 The ball is delivered by Joe Colbeck, Headed effort on goal by Dean Furman from inside the penalty box misses to the right of the target.
6:54 The ball is crossed by Joe Colbeck.
5:21 Free kick awarded for a foul by Neil Kilkenny on Dean Furman. Direct free kick taken by Kelvin Lomax.
1:27 Free kick awarded for an unfair challenge on Sam Vokes by Sean Gregan. Lubomir Michalik takes the direct free kick.
0:00 The match gets underway.
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