The ranks in the Navy SEALs do not different than those in other military units around the world. The regular ranks used in the U.S. Navy are also applied in the U.S. Navy SEAL ranks.
Navy SEAL ranks
The ranks in the Navy SEALs have the same ranks as the other Navy units, but the different names. In the U.S. Navy, ranks are comprised of three groups: Enlisted (E-1 through E-9), Warrant Officer (CWO-1 through CWO-5), and Commissioned Officers (CO-1 through CO-5), and Admiral ranks (CO-6 through CO-10; FADM.)
Most Navy SEALs (about 2,000) are enlisted men who hold the rank of E-4 to E-9 (Petty Officer 3rd Class to Master Chief Petty Officer). They are led by roughly 500 SEAL Officers who hold the rank of O-1 to O-10 (Ensign to Admiral Chief of Naval Operations).
There are also a few SEAL Warrant Officers (perhaps 30 or so) who rank as officers above the senior-most Enlisted but lower than a Commissioned Officer.
Like every military organization, there is a command structure, which requires having different ranks. The same is true of Army Special Forces, U.S. Army Rangers, Delta Force, MARSOC, etc. There are no military organizations where everyone is the same rank.
If you instead meant “Do Navy SEALs have unique ranks?” then the answer is no. The SEALs are part of the Navy and use regular Navy ranks.
Enlisted, from Lowest to Highest
|E-4||Petty Officer Third Class||PO3||Noncommissioned Officer|
|E-5||Petty Officer Second Class||PO2||Noncommissioned Officer|
|E-6||Petty Officer First Class||PO1||Noncommissioned Officer|
|E-7||Chief Petty Officer||CPO||Senior Noncommissioned Officer|
|E-8||Senior Chief Petty Officer||SCPO||Senior Noncommissioned Officer|
|E-9||Master Chief Petty Officer||MCPO||Senior Noncommissioned Officer|
Officers, from Lowest to Highest
|O-2||Lieutenant Junior Grade||LTJG||Junior Officer|
|O-4||Lieutenant Commander||LCDR||Junior Officer|
|O-7||Rear Admiral Lower Half||RDML||Flag Officer|
|O-8||Rear Admiral||RADM||Flag Officer|
|O-9||Vice Admiral||VADM||Flag Officer|
The letter and number represent the rank title and paygrade of the Navy SEAL. It’s important to note rank is different from the paygrade and signifies the level of job duties and leadership responsibilities. Every SEAL can further advance their careers by continuing education and through command and specialty opportunities.