Little Alcatraz, Rock formation in San Francisco Bay, US.

Little Alcatraz is a dark, roughly conical rock in San Francisco Bay about 81 yards (74 m) off the Model Industries Building on the northwest coast of Alcatraz Island. Its lower base is brown and reddish, coated with wet algae-like growth, and it narrows to a rounded, uneven top. The upper half is covered with dark grey and black Brandt's cormorants standing close together, forming a cap over the crest and extending down the slopes on all sides.

The formation got its name after the steamship Paul Pry ran aground on the rocks in 1862, with around 150 passengers on board. The incident drew attention to the hazard and gave the spot its lasting name.

The rock is a resting ground for Brandt's cormorants, which gather in numbers on its upper slopes, as seen in photographs of the formation. The birds cluster densely over the rounded crest, leaving the reddish, algae-covered base below bare. The rock is also known as Paul Pry Rock, after the steamer that struck it in 1862.

Anyone traveling by boat near Alcatraz Island should check tide conditions before heading out, since the rocks can be fully submerged and hard to spot at high tide. The area is easier and safer to navigate when the tide is low and the formation is at least partially visible.

During the last escape attempt from Alcatraz, on December 16, 1962, Darl Lee Parker was found on this rock; he could not swim. The rock lies about 81 yards (74 m) off the Model Industries Building on the island's northwest coast.