ऐडमिरल (admiral) या नौसेनाध्यक्ष किसी देश या राज्य की नौसेना के सर्वोच्च अधिकारी या अधिकारियों को कहा जाता है। तुलना के लिए यह पद थलसेना के 'जनरल' या 'सेनापति' के बराबर समझा जाता है।

Admiral is a military rank, typically the highest or among the highest flag officers in a navy. In the armed forces of the United States and Commonwealth of Nations, an admiral—sometimes clarified as a "full admiral"—is the equivalent of a general in the army or air force. NATO codes place admirals or their equivalents at OF-9, behind only the infrequently awarded rank of fleet admirals (US) or admirals of the fleet (CON) and just above vice-admirals. In premodern contexts, admiral is also used as an informal rank for any commander-in-chief of a navy or major fleet.