1919 U.S. National Championships (tennis)

The 1919 U.S. National Championships were tennis tournaments held at the West Side Tennis Club in Forest Hills, New York City. The women's tournament was held from August 18 to August 23, 1919, while the men's tournament took place from September 1 to September 6, 1919. It marked the final U.S. National Championships held before the full resumption of international competition following World War I.

The men's singles champion was Bill Johnston, who defeated Bill Tilden in the final. Hazel Hotchkiss Wightman won the women's singles title, defeating Marion Zinderstein in the final.

In men's doubles, Norman Brookes and Gerald Patterson were the champions, defeating Vincent Richards and Bill Tilden. Marion Zinderstein and Eleanor Goss won the women's doubles title against Eleonora Sears and Hazel Hotchkiss Wightman.

The mixed doubles title was won by Marion Zinderstein and Vincent Richards, defeating Florence Ballin and Bill Tilden.