Mieczysław Jan Michałowicz (10 September 1876 – 22 December 1965) was a Polish social and political activist, medical doctor of pediatrics, and professor of the Warsaw University.

Michałowicz was born in Saint Petersburg, Russian Empire.

He was a member of the Senate of Poland, first as a supporter of the sanacja regime, but later in opposition to it.

He was one of the co-founders of the Democratic Party (Polish: Stronnictwo Demokratyczne).

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