The 1966 Open Championship was the 95th Open Championship, held 6–9 July at Muirfield Golf Links in Gullane, East Lothian, Scotland. Jack Nicklaus won the first of his three Claret Jugs, one stroke ahead of runners-up Doug Sanders and Dave Thomas. It was the sixth of eighteen major titles for Nicklaus and marked the completion of the first of his three career grand slams. It was the final Open for 1964 champion Tony Lema, who died in a plane crash two weeks later, hours after the PGA Championship.