Forest Green ended their 12-game winless run, edging past fellow strugglers Mansfield at The New Lawn.
Alex Lawless grabbed the winner with a fierce long-range strike after great work by Jonathan Smith.
The Stags had their chances with Nathan Arnold forcing a fine save from home keeper Terry Burton.
But their best opportunity to secure a point came from the spot when Darren Jones fouled Emile Sinclair but Burton saved Adnan Ahmed's penalty.
Forest Green: Burton, Gill, Jones, Kempson, Stonehouse, Low (Afful 73), Lawless (Fowler 39), Smith, Clist, Symonds (Mohamed 73), Platt.Subs Not Used: Robinson, Mangan.
Booked: Jones.
Goals: Lawless 11.
Mansfield: Gamble, Silk, Moses, O'Hare, Jeannin, D'Laryea, Ahmed, Somner (Stallard 63), Sinclair, Lee (O'Connor 63), Arnold.Subs Not Used: Herriott, Chanot, Hurren.
Booked: Stallard.
Att: 872.
Ref: Paul Tierney (Wigan).
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