The 2001 AIG Japan Open Tennis Championships was a tennis tournament played on outdoor hard courts at the Ariake Coliseum in Tokyo in Japan that was part of the International Series Gold of the 2001 ATP Tour and of Tier III of the 2001 WTA Tour. The tournament ran from October 1 through October 7, 2001. Lleyton Hewitt and Monica Seles won the singles titles.
See main article: 2001 AIG Japan Open Tennis Championships – Men's singles. Lleyton Hewitt defeated Michel Kratochvil 6–4, 6–2
See main article: 2001 AIG Japan Open Tennis Championships – Women's singles. Monica Seles defeated Tamarine Tanasugarn 6–3, 6–2
See main article: 2001 AIG Japan Open Tennis Championships – Men's doubles. Rick Leach / David Macpherson defeated Paul Hanley / Nathan Healey 1–6, 7–6(8–6), 7–6(7–4)
See main article: 2001 AIG Japan Open Tennis Championships – Women's doubles. Liezel Huber / Rachel McQuillan defeated Janet Lee / Wynne Prakusya 6–2, 6–0