Waseda University (Japanese: 早稲田大学), abbreviated as Waseda (早稲田) or Sōdai (早大), is a private research university in Shinjuku, Tokyo. Founded in 1882 as the Tōkyō Professional School by Ōkuma Shigenobu, the fifth prime minister of Japan, the school was formally renamed Waseda University in 1902.

Waseda is organized into 36 departments: 13 undergraduate schools and 23 graduate schools. As of 2023, there are 38,776 undergraduate students and 8,490 graduate students. In addition to a central campus in Shinjuku (Waseda Campus and Nishiwaseda Campus), the university operates campuses in Chūō, Nishitōkyō, Tokorozawa, Honjō, and Kitakyūshū. Waseda also operates 21 research institutes at its main Shinjuku campus.

The university is selected as one of the Top Type (Type A) universities under MEXT's Top Global University Project.

The university's faculty and alumni include eight prime ministers of Japan; three prime ministers of Korea; a number of important figures of Japanese literature, including Haruki Murakami; founders of leading Japanese and Korean companies such as Samsung, Sony, Ito En, Lotte, CJ Group, POSCO; and many CEOs, including Japan's richest person, Tadashi Yanai.