Linfield will need to appoint a new chairman after Jim Kerr stepped down from the role late last night.
Kerr has also quit his position as director following a board meeting at Windsor Park.
The news follows criticism of the club regarding their relationship with the Irish Football Association - new owners of Windsor Park - and media claims that Kerr had been verbally abusive to match officials at the 1-0 Danske Bank Premiership defeat to Coleraine last week.
A Blues statement released late last night did not explain the reason for Kerr's resignation.
It read: "It is with deep regret that the board of Linfield Football Club have this evening accepted Jim Kerr's resignation as both Chairman of the club as well as his position as a board director. The club would like to pay tribute to Jim's immense contribution to Linfield over very many years.
"Jim was first elected to the board in 2003 and has served as chairman for more than 9 years since his election to the post in 2007. The board are totally unanimous in giving fulsome praise to all the hard work that our former chairman has carried out on behalf of the club.
"At a later date it is the intention of the club to more formally recognise Jim Kerr's long years of service to Linfield Football Club."