Caroline Gray has decided to step down as general manager of Fairyhouse.
Currently on maternity leave, Gray has opted not to return to her role and leaves with immediate effect.
She joined the Irish Horseracing Authority in 2000 and took over as general manager of Fairyhouse in 2007, operating with great success.
Gray secured the Ladbrokes sponsorship deal for the Irish Grand National and oversaw significant rationalisation at the County Meath venue.
She said: "I have really enjoyed my 11 years working in the horse racing industry. However, I feel the time has now come to move on and in particular to spend more time with my young family.
"I would like to acknowledge the support of all those in the industry with whom I came in contact over the years and in particular my work colleagues in HRI and Fairyhouse."
Brian Kavanagh, CEO of Horse Racing Ireland, said: "I would like to thank Caroline for the significant contribution which she has made to Irish racing and offer her every good wish for the future.
"Pending an overall review of our racecourse structures, Peter Roe will continue as acting general manager at Fairyhouse, and Nessa Joyce will continue in the same role at Tipperary."