Danny North's first-half double set struggling Grimsby on the way to a first league win in nine games.
The striker pounced on a loose ball to put his side ahead after 10 minutes and he doubled the lead on the stroke of half-time, racing away and score.
Liam Hatch should have reduced arrears after 51 minutes but fluffed a header.
Grimsby were denied a penalty when referee Andy Penn missed Sagi Burton's handball but substitute Andy Taylor did get their third goal on 89 minutes.
Barnet: Harrison, Devera (Nicolau 70), Burton, Yakubu (O'Cearuill 45), Gillet, Leary (Carew 51), Bishop, Wright, Puncheon, Hatch, Birchall.
Subs Not Used: Beckwith, Grazioli.
Grimsby: Montgomery, Atkinson, Bennett, Fenton, Newey, Till (Bore 45), Hird, Hunt, Toner, North (Taylor 66), Jones, Taylor (Rankin 90).
Subs Not Used: Clarke, Hegarty.
Booked: Jones.
Goals: North 11, 44, Taylor 89.
Att: 2,059.
Ref: Andy Penn (W Midlands).
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