Palacio Vasallo (Spanish, "Vasallo Palace") is the seat of the Legislative Branch of the municipal government of Rosario, province of Santa Fe, Argentina. The building, designed by Alejo Infante and completed in 1911, is located near the National Flag Memorial, and has been the site of Rosario's Deliberative Council since May 18, 1951. It was donated to the city by notable surgeon Dr. Bartolomé Vassallo (who died in 1945), together with a collection of artistic works kept there.
The Palace is on the list of works and sites of patrimonial value of the municipality of Rosario, as item 011340800.