Igusa, い草 or 井草, いくさ (soft rush, lit. well grass) is a Japanese name. It may refer to:

Place name

• Igusa High School, a high school in Nerima, Tokyo
• Igusa, former village in Saitama Prefecture
• Igusa, Suginami, Tokyo with Kami-Igusa (Upper Igusa) and Shimo-Igusa (Lower Igusa) train stations in Suginami, Tokyo

Surname

• Jun-ichi Igusa (井草 準一 Igusa Jun’ichi), d. 2013, Japanese mathematician at Johns Hopkins University
• Kiyoshi Igusa, Japanese-American mathematician and professor at Brandeis University, son of Jun-ichi Igusa
• Mutsuko Igusa, current publisher of Nihon Tarento Meikan, a directory of Japanese television personalities
• Shigetaro Igusa, founder of "Leisure Tsūshin-sha", now "VIP Times", publishers of Nihon Tarento Meikan

Fictional characters

• Igusa, green-haired character from the light novel, manga, and anime series Inukami!