Alcatraz Island
Alcatraz Island from Tiburon Ferry
{{{base_caption}}}
Location	San Francisco Bay, California, US
Nearest city	San Francisco, California
Area	22 acres (8.9 ha)

Alcatraz Island (sometimes just called Alcatraz or The Rock) is a small island in San Francisco Bay in California. It was first a lighthouse, then a military fort, then a military prison, and finally a federal prison. In 1969, it became a museum.

The name Alcatraz comes from the original Spanish name of the island, Isla de los alcatraces (Island of the pelicans). It was given that name when a Spanish explorer, Juan Manuel de Ayala, noticed the great amount of pelicans roosting on the island.