The USS Decatur (DDG-73) is a guided missile destroyer of the United States Navy.

Decatur was involved in patrolling the Persian Gulf / Strait of Hormuz during December 2003. On 14 December she intercepted a dhow carrying about 1750Kg of marijuana, with an estimated street value of $8M to $10M US. US sources claimed that the drugs were being smuggled to raise funds for the operations of Al Quaeda, but have so far refused to release the evidence on which this claim is based.

Other ships have been named USS Decatur.