Lincoln City have released defenders Paul Robson, Dan Coupland and Elliot Green and goalkeeper Jake Turner by mutual consent.
Robson, 29, joined in January 2012 and made 30 appearances for the Imps, 12 of them this season.
Coupland and Green, both 19, signed contracts in the summer after coming through City's youth system but neither played a first-team game.
Ex-Scunthorpe keeper Turner, 20, also failed to appear for City's first team.
The quartet follow Peter Bore, Adam Boyd and John Nutter out of Sincil Bank during the January transfer window.