Staring at a potential relegation battle as 2015 began, four wins and a draw from five games means the Cobblers are now thinking about the play-offs.
Wilder, who celebrated one year in charge at Sixfields during January, moved quickly as the transfer window opened to shake up his squad and has been vindicated with some excellent performances.
Chairman of the panel which decides on the Sky Bet award, former Scotland manager George Burley, said: “Chris has worked hard to get consistency from his team this season.
"Getting 13 points from 15 was a great effort which has taken Northampton Town towards the play-off positions. Winning 5–1 away at Accrington was a splendid result.”