List of champions of the 1884 U.S. National Championships (now known as the US Open). The tournament was held from 26 August to 27 August on the outdoor grass courts at the Newport Casino in Newport, Rhode Island. It was the 4th U.S. National Championships and the second Grand Slam tournament of the year.

Richard D. Sears defeated Howard Taylor 6–0, 1–6, 6–0, 6–2

Richard D. Sears / James Dwight def. Walter Berry / Alexander Van Rensselaer, 6–4, 6–1, 8–10, 6–4

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