Three Japanese destroyers have been named Ōnami:

• Japanese destroyer Ōnami (1942), a Yūgumo-class destroyer of the Imperial Japanese Navy during World War II
• JDS Ōnami (DD-111), an Ayanami-class destroyer of the Japanese Maritime Self-Defense Force (JMSDF)
• JS Ōnami (DD-111), a Takanami-class destroyer of the JMSDF