The 1990 Seniors' British Open, for sponsorship reasons also known as the Volvo Seniors' British Open, was a professional golf tournament for players aged 50 and above and the fourth Seniors' British Open (later known as the Senior Open Championship), held from 26 to 29 July at Turnberry Golf Resort in South Ayrshire, Scotland, United Kingdom.

In 2018, the tournament was, as all Senior British Open Championships played 1987–2002, retroactively recognized as a senior major golf championship and a PGA Tour Champions (at the time named the Senior PGA Tour) event.

54-year-old Gary Player won his second Senior British Open title and eighth senior major championship. He became the first golfer with multiple titles in both The Open Championship and the Senior British Open Championship.

The Ailsa Course at Turnberry, situated 80 kilometres south of Glasgow, Scotland, on headland along the Firth of Clyde, overlooking the Isle of Arran and Ailsa Craig, was initially opened with 13 holes in 1901, designed by Willie Fernie, and later completed to 18 holes. It was redesigned by Mackenzie Ross between 1949 and 1951.

The championship was the fourth in a row played at Turnberry.

The course had previously hosted The Open Championship twice; 1977 and 1986.

The field included former winners of The Open Championship; Gary Player (won), Arnold Palmer (4th) and Bob Charles (tied 6th).

Sunday, 29 July 1990