Gottardo Fidele Piazzoni (April 14, 1872 – August 1, 1945) was a Swiss-born American landscape painter, muralist and sculptor of Italian heritage, a key member of the school of Northern California artists in the early 1900s.

[7] He sought out the lighting effects of certain times of day, taking a "special interest in full moonrises, the viewing of which became a family ritual.

By early 1901 Piazzoni was sharing a studio with fellow painter Xavier Martínez, with whom he founded a year later the short-lived California Society of Artists.

[10] In 1927 he publicly protested when the directors of the municipal Oakland Art Gallery threatened to remove two displayed paintings of “explicit female nudes.”[14] Piazzoni was also a good friend of Impressionist Granville Redmond and introduced the Deaf artist to Charlie Chaplin.

The relationship of Redmond, Chaplin and Piazzoni is explored in a play by Steve Hauk, "The Floating Hat," published by the Traditional Fine Art Organization, Inc.