1984 Japan Open Tennis Championships

The 1984 Japan Open Tennis Championships was a tennis tournament played on outdoor hard courts in Tokyo, Japan that was part of the 1984 Volvo Grand Prix and the 1984 Virginia Slims World Championship Series. The tournament was held from 8 October through 14 October 1984. David Pate and Lilian Drescher won the singles titles.

Men's singles
🇺🇸 David Pate defeated 🇺🇸 Terry Moor 6–3, 7–5
 * It was Pate's 1st singles title of his career.

Women's singles
Lilian Drescher defeated 🇺🇸 Shawn Foltz 6–4, 6–2
 * It was Drescher' only career title.

Men's doubles
🇺🇸 David Dowlen / Nduka Odizor defeated 🇺🇸 Mark Dickson / 🇺🇸 Steve Meister 6–7, 6–4, 6–3
 * It was Dowlen's 2nd title of the year and the 3rd of his career. It was Odizor's 2nd title of the year and the 5th of her career.

Women's doubles
🇺🇸 Betsy Nagelsen / 🇺🇸 Candy Reynolds defeated 🇦🇷 Emilse Raponi-Longo / 🇦🇷 Adriana Villagrán-Reami 6–3, 6–2
 * It was Nagelsen's 3rd title of the year and the 14th of her career. It was Reynolds' 3rd title of the year and the 20th of her career.