Most Improved (foaled 3 May 2009) is an Irish Thoroughbred racehorse who won the 2012 St James's Palace Stakes at Royal Ascot.

He was owned by Iraj Parvizi and trained by Brian Meehan, before being purchased by Derrick Smith, Sue Magnier and Michael Tabor and transferred to Aidan O'Brien.

[1] In early August 2011 Most Improved made his first racecourse appearance and finished second in a Newmarket maiden, failing to win by a short head.

[4] On his next appearance, Most Improved ran poorly in the Prix Jacques Le Marois, being virtually pulled up in the closing stages by Fallon, as he finished last of the eleven runners behind Excelebration.

[5] In his first race for Aidan O'Brien, Most Improved finished third of four runners in the International Stakes at The Curragh, about ten lengths behind winner Flying the Flag.