Kazimierz Zalewski (5 December 1849 – 11 January 1919), pseudonym Jerzy Myriel, was a Polish dramatist, literary and theatre critic, one of the leading author of middle-class positivistic drama.

Zalewski was born in Płock.

He was the publisher and editor of the magazine Wiek (1875–1905), and managing director of Teatr Mały in Warsaw from 1909 until his death, in Warsaw.

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