Percy & Hamilton was an architectural firm in San Francisco, California during 1880 to 1899.^[1]

The firm was a partnership of George Washington Percy (1847–1900) and Frederick Foss Hamilton (1851–1899).^[2] During the period of 1890 to 1900, they designed numerous residences and churches in the Pacific Heights area.^[1] Many of their works were destroyed in the 1906 earthquake; others were destroyed for redevelopment. Several of their works survive and are listed on the National Register of Historic Places.

Select list of architectural works, in order by date.

• Charles Heise House (1884), at 2517 Pacific Avenue, San Francisco, California^[1]
• Greystone Cellars (1886), 2555 Main Street, St. Helena, California, NRHP-listed
• Sharon Building (1887), in Golden Gate Park, San Francisco, California^[1]
• Children's Playhouse or Children's Quarters (1888, now known as the Koret Children's Playground) in Golden Gate Park, San Francisco, California^[3]
• First Unitarian Church (1889), at 1187 Franklin Street, San Francisco, California; San Francisco Landmark #40^[2]
• Frederick Hamilton House (1890), at 2513 Pacific Avenue, San Francisco, California^[1]
• J. C. Stubbs House (1892), at 2519 Pacific Avenue, San Francisco, California^[1]
• Trinity Presbyterian Church (1892), 3261–23rd Street, San Francisco, California; NRHP-listed
• Cantor Arts Center (1894) at Stanford University, Stanford, California^[3]
• Alameda City Hall (1896), Santa Clara Avenue and Oak Street, Alameda, California; NRHP-listed
• Alvinza Hayward Building (1906), 400 Montgomery Street, San Francisco, California; San Francisco Landmark #161;^[1] after Hamilton's death, Percy worked briefly with Willis Polk; this partnership designed the Alvinza Hayward Building, located in the financial district.

• List of San Francisco Designated Landmarks