Jason Norville scored the only goal of the game to earn Barnet their first away win of the season.
Norville bundled in from close range after Nicky Nicolau's cross from the left saw Adam Birchall send in a header which was pushed out by Barry Roche.
But Chesterfield were guilty of wasting a string of chances.
Their skipper Aaron Downes was on target with a late header only to be denied by an excellent save from Barnet keeper Lee Harrison.
Chesterfield: Roche, Robertson, Kovacs, Downes, Picken, Leven, Winter (Jackson 73), Niven, Lowry (Rooney 46), Lester, Fletcher.
Subs Not Used: Gray, O'Hare, Allison.
Booked: Kovacs, Leven.
Barnet: Harrison, Gillet (Nicolau 46), Burton, Yakubu (O'Cearuill 80), Devera, Puncheon, Porter, Bishop, Wright, Norville (Thomas 75), Birchall.
Subs Not Used: Beckwith, Carew.
Booked: Puncheon.
Goals: Norville 69.
Att: 4,088.
Ref: Carl Boyeson (E Yorkshire).
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