The 2008 Senior Open Championship was a senior major golf championship and the 22nd Senior Open Championship, held on 24–27 July at Royal Troon Golf Club in South Ayrshire, Scotland. It was the first Senior Open Championship played at the course and the seventh Senior Open Championship played as a senior major championship.

Bruce Vaughan won after a playoff over John Cook. It was Vaughan's first senior major championship victory.

The event was the first Senior Open Championship played at Royal Troon Golf Club, taking place at the club's Old Course, designed by Willie Fernie and George Strath. The club was founded in 1878 and had previously hosted The Open Championship eight times.

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The field consisted of 144 competitors; 130 professionals and 14 amateurs.

18-hole stroke play qualifying rounds were held on Monday, 21 July, on three places in Scotland, Dundonald Links Golf Club, Western Gailes Golf Club and Glasgow Gailes Golf Club, for players who were not already exempt. The leading players from the qualifying competitions joined the exempt players for the championship.

71 players made the 36-hole cut, all of them professionals and no amateurs.

Four past Senior Open champions participated. Two of them made the 36-hole cut; 2003, 2005 and 2007 champion Tom Watson (tied 5th) and 2004 champion Pete Oakley (tied 68th). 1989 and 1993 champion Bob Charles and 1988, 1990 and 1997 champion Gary Player did not make the cut.