Knize may refer to:
Kníže (title), equivalent of "duke" or "prince", used in medieval Slavic countries such as Bohemia Kniže & Comp., the Viennese clothing store named after a Czech surname Josef Kniže (d. 1880), Czech tailor who founded Kniže & Comp. Frederic Wolff-Knize (1890–1949), Austrian businessman and art collector Petr Kníže, Czech martial artist