The 2013 Senior Open Championship was a senior major golf championship and the 27th Senior Open Championship, held on 25–28 July at Royal Birkdale Golf Club in Southport, England, United Kingdom. It was the 11th Senior Open Championship played as a senior major championship. Mark Wiebe won after a play-off over Bernhard Langer In the first Monday finish in Senior Open Championship history. It was Wiebe's first senior major championship victory.