1919 U.S. National Championships – Men's singles

Men's singles
1919 U.S. National Championships
Champion Bill Johnston
Runner-up Bill Tilden
Score6–4, 6–4, 6–3
Draw128
Seeds

Bill Johnston defeated Bill Tilden in the final, 6–4, 6–4, 6–3 to win the men's singles tennis title at the 1919 U.S. National Championships. It was Johnston's second U.S. Championships singles title, after 1915.

The competition had an unseeded draw of 128 players.