Kavanagh was appointed HRI’s first CEO in 2001 and held the position for 20 years.
HRI has now launched a recruitment campaign to find its next chief executive.
“I would like to thank Brian Kavanagh for 20 years of incredible service and deep commitment to Horse Racing Ireland and to the industry in Ireland,” HRI chairman Nicky Hartley said.
“His knowledge and expertise, at home and abroad, will no doubt ensure that Brian will continue to play a significant part in the industry, and we wish him well.”
Applications for the job have already opened and close on Monday, April 19.
“It has been a privilege to serve as chief executive of Horse Racing Ireland and to work under three different chairmen who each promoted a strategic vision for the Irish horse racing and breeding industries.” said Brian Kavanagh.
“Last week was a good week for racing, but we cannot rest on our laurels and there is much work to do between now and September.”
“While Brexit and Covid-19 are currently providing significant challenges, there are wonderful opportunities facing the sector also. Our horses and our people are our greatest strength”.