J. Foster Warner (1859–1937), also known as John Foster Warner, was a Rochester, New York-based architect. He was the son of one of Rochester's most prominent 19th century architects, Andrew Jackson Warner (1833-1910). After receiving his architectural training in his father's office, the younger Warner opened his own office in 1889 and remained in continuous practice until his death in 1937.
1893: Granite Building, Rochester, New York, listed on the National Register of Historic Places in 1984.
1894-1896: Monroe County Courthouse, Rochester, New York, listed on the National Register of Historic Places in 1974 as a contributing structure.
1897: Sibley Triangle Building, Rochester, New York, listed on the National Register of Historic Places in 1985.
1902: East High School, Rochester, New York, listed on the National Register of Historic Places in 1983.
1903: Brick Presbyterian Church Complex, Rochester, New York, listed on the National Register of Historic Places in 1992.
1904: Sibley's, Lindsay and Curr Building, Rochester, New York, listed on the National Register of Historic Places in 2014.
1905: George Eastman House, Rochester, New York, designated a National Historic Landmark in 1966.
1924: National Company Building, Rochester, New York, listed on the National Register of Historic Places in 1984.
1926: Rowe House, Wayland, New York, listed on the National Register of Historic Places in 2008.
1928: Our Lady of Mercy High School, Rochester, NY, listed as Historic Landmark, Town of Brighton, New York.
