Bogusław Radziwiłł (Lithuanian: Boguslavas Radvila; 3 May 1620 – 31 December 1669) was a Polish princely magnate and a member of the Polish-Lithuanian szlachta, or nobility.

The Swedish defeat and eventual retreat from the territories of the Commonwealth abruptly ended the plans of Janusz and Bogusław.

Boguslaw married Anna Maria Radziwiłł, the only daughter of his relative and collaborator, the late prince Janusz.

Bogusław is the archvillain in a novel by Henryk Sienkiewicz, The Deluge, which is mandatory school reading in Poland, and is also the basis for a very popular eponymous film.

His estates and the task to protect the Polish Reformed Church passed to his only daughter, Princess Ludwika Karolina.