Brighton have released 14 players, but offered new deals to player-of-the-season Andrew Whing and strikers Lloyd Owusu and Gary Hart.
Defender Kerry Mayo is leaving after 14 years at the club, with Doug Loft, Tommy Fraser, Adam Hinshelwood and John Sullivan also being let go.
Jake Robinson, Chris Birchall, Seb Carole and Jason Jarrett are also out.
Meanwhile, the Seagulls are trying to make midfielder Gary Dicker's loan deal from Stockport permanent.
Manager Russell Slade said: "There have been some difficult decisions to make. Telling players there's no new deal on offer is the most difficult thing of the job."
Loanees Gary Borrowdale, Al Bangura and Calvin Andrew, who is likely to miss a large part of next season with injury, have all returned to their parent clubs.
Youngsters Sam Gargan, Kane Louis, Andy Pearson, Dan Royce and Kane Wills have also left the club.
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