Litwinowicz is a Polish and a Belarusian surname derived from the word Litwin ("Lithuanian" or anyone from the Grand Duchy of Lithuania). It is also spelled Litvinovič and Litvinovich, from Belarusian: Лiтвiновiч.

Surnames of similar etymology: Slavic: Litvin, Litvinchuk, Litvinov, Litwin, Litvak, Litovchenko; German: Litauer, Littauer.

Litwinowicz, Litvinovich, or Litvinovič may refer to:

• Aleksander Litwinowicz (1879-1948), Polish general
• Irena Litvinovič (born 1958), Polish-Lithuanian theatre director
• Ivan Litvinovich (born 2001), Belarusian trampoline gymnast
• Spirydion Litwinowicz (Spiridon Litvinovich), Greek Catholic Metropolitan of Lviv (1866-1869)