Itsuko Hasegawa (長谷川 逸子) (born 1941 in Shizuoka) is a Japanese architect. She received her degree in architecture from Kanto Gakuin University (1964), trained with Kiyonori Kikutake until 1969, and then studied and worked at the Tokyo Institute of Technology. In 1971, she became an assistant in Kazuo Shinohara Atelier in TIT.

In 1979 she formed her own design firm, Itsuko Hasegawa Atelier, which has designed a number of award-winning buildings in Japan and abroad. Hasegawa is an Honorary Fellow of the Royal Institute of British Architects, and has received the Avon Arts Award, the Building Contractor's Society Prize for the Shonandai Cultural Center, the Cultural Award for Residential Architecture (Fukuoka, Japan), and a Design Prize from the Architectural Institute of Japan.