1975 Japan Open Tennis Championships
Date	2–8 November
Edition	3rd
Category	Grand Prix (Grade AA)
Draw	64S/32D
Prize money	$100,000
Surface	Hard / outdoor
Location	Tokyo, Japan
Venue	Denen Coliseum
Champions
Men's singles
Raúl Ramírez[1]
Women's singles
Kazuko Sawamatsu
Men's doubles
Brian Gottfried / Raúl Ramírez[2]
← 1974 · Japan Open · 1976 →

The 1975 Japan Open Tennis Championships was a combined men's and women's tennis tournament played on hard courts. The men's events were part of the 1975 Commercial Union Assurance Grand Prix and took place at the Denen Coliseum in Tokyo, Japan. The tournament was held from 2 November through 8 November 1975. Raúl Ramírez and Kazuko Sawamatsu won the singles titles.^[3]

Finals

Men's singles

Raúl Ramírez defeated Manuel Orantes 6–4, 7–5, 6–3

• It was Ramirez' 4th singles title of the year and the 7th of his career.

Women's singles

Kazuko Sawamatsu defeated Ann Kiyomura 6–2, 3–6, 6–1

• It was Sawamatsu's 1st singles title of the year and the 2nd and last of his career.

Men's doubles

Brian Gottfried / Raúl Ramírez defeated Juan Gisbert Sr. / Manuel Orantes, 7–6, 6–4

Women's doubles

Ann Kiyomura / Kazuko Sawamatsu defeated Kayoko Fukuoka / Kiyomi Nomura 6–2, 6–3