Four ships of the United States Navy have been named Canonicus for Canonicus, a chief of the Narragansett Indians, who befriended Roger Williams, and presented him with a large tract of land for the Rhode Island colony.

• USS Canonicus (1863), a monitor in commission from 1864 to 1869 and from 1872 to 1877.
• USS Canonicus (ID-1696), a minelayer in commission from 1918 to 1919 which also served as a troop transport
• USS Canonicus (YT-187), a tug in service during World War II.
• Canonicus (ACM-12), a minelayer.

• Canonicus-class monitor, a class of nine ships built for the Union Navy during the American Civil War

List of ships with the same or similar names

This article includes a list of ships with the same or similar names. If an internal link for a specific ship led you here, you may wish to change the link to point directly to the intended ship article, if one exists.