1912 U.S. National Championships – Men's singles

Men's singles
1912 U.S. National Championships
Champion Maurice McLoughlin
Runner-up Wallace F. Johnson
Score3–6, 2–6, 6–2, 6–4, 6–2

Maurice McLoughlin defeated Wallace F. Johnson 3–6, 2–6, 6–2, 6–4, 6–2 in the final to win the men's singles tennis title at the 1912 U.S. National Championships. The event was held at the Newport Casino in Newport, R.I. in the United States. The challenge round was abolished in this edition, thus requiring all participants, including the defending champion, to play the main draw. There were more than 128 players in the draw.