Vileišis Palace is a Neo-baroque style architectural ensemble in Vilnius, Lithuania, built for Petras Vileišis. Vileišis was a prominent Lithuanian engineer, political activist, publisher, and philanthropist who commissioned the palace in 1904 and supervised its construction. The ensemble consists of a main house, a guesthouse, and an outbuilding. It currently houses the Institute of Lithuanian Literature and Folklore. It was renovated during the early 2000s.

Petras Vileišis was a prominent Lithuanian engineer specializing in the construction of railroad bridges. He was very active in Lithuanian public life and together with his brothers Jonas and Antanas became one of the key figures of the Lithuanian National Revival.