The 1991 Seniors' British Open was a professional golf tournament for players aged 50 and above and the fifth Senior British Open, held from 11 to 14 July at Royal Lytham & St Annes Golf Club in Lytham St Annes, Lancashire, England, United Kingdom.

[4][5][6] The event was the first Senior Open Championship of four in a row held at Royal Lytham & St Annes Golf Club.

All of them made the 36-hole cut, 1989 champion Bob Charles (tied 2nd), 1988 and 1990 champion Gary Player (tied 5th) and 1987 champion Neil Coles (tied 7th), Sunday, 14 July 1991 Bobby Verwey led by one stroke going in to the last round, ahead of defending champion Gary Player and English home players Peter Butler and Tommy Horton.

On the last hole of the last round, Verwey drove into a fairway bunker and played out safe to put his third shot on the green.

With his 72-hole-score one over par, he beat Bob Charles, who finished with 67, and Horton by one stroke.