| Henderson Ryan | |
| Birth Date: | January 16, 1856 |
| Birth Place: | Valhermoso Springs, Alabama |
| Death Date: | August 29, 1927 (aged 73) |
| Death Place: | California |
| Alma Mater: | Agricultural and Mechanical College of Kentucky |
| Significant Buildings: | Old Central, Ballard Carnegie Library, Neptune Theatre |
Henderson Ryan (January 16, 1856 – August 29, 1927) was an American architect notable for designing buildings in Seattle Washington in the early 20th century, including several theaters and a significant number of residential apartment buildings. Among other buildings he was the architect of the Ballard Carnegie Library and Neptune Theatre, both Seattle city landmarks.