The United States Senior Men's Amateur Golf Championship is a national tournament for amateur golf competitors at least 55 years of age. It is operated by the United States Golf Association (USGA).
The tournament starts with 36 holes of stroke play, with the top 64 competitors advancing to the match play portion of the tournament. Golfers must have a USGA handicap index of 7.4 or lower to enter.
The tournament was founded in 1955, expanding on a tournament conducted by the U.S. Senior Golf Association (not affiliated with the USGA), which itself had grown from a senior amateur event at the Apawamis Golf Club in the early 1900s. Membership in this precursor tournament was limited, so the USGA agreed to start a national championship open to all senior golfers.
Senior Amateur contestants have been permitted to ride in carts since 1969.