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| Equivalent NATO code | OF-8 | OF-7 | OF-6 | OF-5 | OF-4 | OF-3 | OF-2 | OF-1 | OF(D) | |
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 Ireland |
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| Irish | Leas-Aimiréal | Seachaimiréal | Ceannasóir | Captaen | Ceannasaí | Leifteanant-Cheannasaí | Leifteanant | Fo-Leifteanant | Meirgire | Dalta |
| English | Vice admiral | Rear admiral | Commodore | Captain | Commander | Lieutenant commander | Lieutenant | Sub lieutenant | Ensign | Officer cadet |
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| Equivalent NATO code | OR-9 | |||
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Ireland |
 Executive |
 Administrative |
 Engineering |
 Communications |
| Irish | Oifigeach Barántais | |||
| English | Warrant officer | |||
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| Equivalent NATO code | OR-8 | OR-7 | OR-6 | OR-5 | OR-4 | OR-3 | OR-2 | OR-1 |
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Ireland |
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No insignia |
| Irish | Ard-Mhion-Oifigeach Sinsearach | Ard-Mhion-Oifigeach | Mion-Oifigeach Sinsearach | Mion-Oifigeach | Mairnéalach Ceannais | Mairnéalach Inniúil | Mairnéalach | Earcach |
| English | Senior chief petty officer | Chief petty officer | Senior petty officer | Petty officer | Leading seaman | Able seaman | Ordinary seaman | Recruit |