Selby Town manager Leon Sewell has been sacked after only nine games in charge.
He took over at the club in summer and they are bottom of the Northern Counties East League Premier division with just two points.
A statement from the club said: "Selby Town felt that a change was needed sooner rather than later.
"The season is already a quarter of the way through for the club and, if they are to avoid relegation this term, a change was thought necessary now."
It continued: "The club would like to thank Leon for all his hard work and commitment to the club and wish him every success in the future."
Former Harrogate Town assistant manager Dave Heard has been appointed as Sewell's successor.
He will take charge of the team with coach Duncan McNaughton for Saturday's FA Vase tie at home to Winterton Rangers.
Heard spent six years at Harrogate Town.