1908 U.S. National Championships (tennis)

The 1908 U.S. National Championships were tennis tournaments held in August 1908. The men's tournament was held at the Newport Casino in Newport, Rhode Island, beginning August 17. The women's tournament was held at the Philadelphia Cricket Club in Philadelphia, Pennsylvania, starting on August 24.

Beals Wright defeated Fred Alexander in the men's singles final to win his only U.S. National Championship title. Maud Barger-Wallach defeated Evelyn Sears in the women's singles final to win her only U.S. National Championship title.

In men's doubles, Fred Alexander and Harold Hackett defeated Raymond Little and Beals Wright. In women's doubles, Evelyn Sears and Margaret Curtis defeated Carrie Neely and Miriam Steever.

The mixed doubles event was won by Edith Rotch and Raymond Little, who defeated Louise Hammond Raymond and Edwin Fuller.