Free Public Library of Petaluma
 The Free Public Library of Petaluma (also Old Carnegie Library Carnegie Free Library and Petaluma Historical Library and Museum) is a research library and history museum at 20 Fourth Street in Petaluma Sonoma County California US. Built in 1904 as a Carnegie Free Library it was designed by Brainerd Jones as his first major commission before the architect gained regional recognition. In the 1970s it was re-purposed as a research library and historical museum.