University Bridge, Bascule bridge in Eastlake, Seattle, United States.

University Bridge is a bascule bridge with dual leaves that spans Portage Bay, connecting Eastlake to the University District. The steel structure allows vessels passing underneath to access the Lake Washington Ship Canal.

Opened on July 1, 1919, as the Eastlake Avenue Bridge, it was renamed the University Bridge on June 30, 1919. By 1930 deterioration forced a refit: timber trestle approaches became concrete and steel, control towers were rebuilt, and wooden paving was replaced by the first open steel-mesh grating in the United States. The rebuilt bridge opened on April 7, 1933.

Streetcars of the Seattle Municipal Street Railway crossed the bridge until 1940; trolleybuses took over from 1940 to 1963 and returned in 1981. Since 1984, when Vancouver's Cambie Street Bridge closed, this bridge and the Montlake Bridge have been the only movable bridges in the Western Hemisphere still used by trolleybuses, today on King County Metro routes 49 and 70.

The bridge carries Eastlake Avenue over Portage Bay between Eastlake and the University District, and its deck includes walkways for pedestrians and cyclists. King County Metro trolleybus routes 49 and 70 cross it. On hot summer days crews spray the steel with cool water so the structure does not expand and bind.

The 1933 rebuild introduced the first open steel-mesh grating road surface in the United States, replacing wooden paving that had to be renewed about every ten years. The grating itself was replaced only once, in 1990. On hot summer days the bridge is doused with cool water to keep the steel from expanding and binding.