Robert Wilson Sears (30 November 1884 – 9 January 1979) was an American fencer and modern pentathlete.
He won a bronze medal in the team foil event at the 1920 Summer Olympics.A 1909 graduate of the United States Military Academy, he was captain of the Army team that twice won the IFA foil team title.
In 1909 he shared individual honors with his teammate, Reginald Cocroft.
Sears spent most of his military career as an Ordnance officer but during World War II was a regimental commander in the 35th Infantry Division in France.
At the age of 60, he was the oldest combat soldier in the European Theater of Operations.