Ivor originally offered to relinquish his position last summer, but was asked to continue to help with the transition following Wycombe Wanderers Trust’s acquisition of the club.
His 28-year affiliation with the Wanderers will be extended in the role of vice president, while Don Woodward will now act as sole chairman.
The 72-year-old received a Long Service Award from the Football League in September 2012, a few months after he was honoured in the Queen’s June Birthday Honours list for services to football and the community in High Wycombe.
After two years as a director, he was appointed chairman in 1987 and oversaw the club’s rise into the Football League under the tutelage of the man he appointed, Martin O’Neill.
Ivor told wwfc.com: “I arrived at the club when Wycombe were in the Isthmian League and 500 people were coming to watch, I leave them as a Football League club.
“I’ve had an unbelievable 28 years and I will always treasure them, but it’s the right time for me to go and allow the Trust to carry on their good work.
“Being chairman is 24/7 and although I’ve enjoyed every minute of it, I’m looking forward to spending some more time with my wife Janet and my family.”
Don Woodward told wwfc.com: “Ivor’s contribution to the club has been invaluable, from the moment his association began right up to the present day.
“I would like to thank him for his outstanding service over the past 28 years, but especially the last 12 months as his insight and knowledge have been crucial in helping the Trust.”