The 1930 U.S. National Championships (now known as the US Open) was a tennis tournament that took place on the outdoor grass courts at the West Side Tennis Club, Forest Hills in New York City, United States. The tournament ran from August 28 until September 13. It was the 50th staging of the U.S. National Championships and the fourth Grand Slam tennis event of the year.

Finals

Men's singles

🇺🇸 John Doeg defeated 🇺🇸 Frank Shields 10–8, 1–6, 6–4, 16–14

Women's singles

🇬🇧 Betty Nuthall defeated 🇺🇸 Anna McCune Harper 6–1, 6–4

Men's doubles

🇺🇸 George Lott / 🇺🇸 John Doeg defeated 🇺🇸 Wilmer Allison / 🇺🇸 John Van Ryn 8–6, 6–3, 4–6, 13–15, 6–4

Women's doubles

🇬🇧 Betty Nuthall / 🇺🇸 Sarah Palfrey defeated 🇺🇸 Edith Cross / 🇺🇸 Anna McCune Harper 3–6, 6–3, 7–5

Mixed doubles

🇺🇸 Edith Cross / 🇺🇸 Wilmer Allison defeated 🇺🇸 Marjorie Morrill / 🇺🇸 Frank Shields 6–4, 6–4