Oetwil may refer to:

• Oetwil am See, Switzerland
• Oetwil an der Limmat, Switzerland

• HMS Adamant (1940)
• HMS Admirable
• HMS Admiral Rainier (1800)
• HMS Adur
• HMS Adur (K 269)
• HMS Adventure (1646)
• HMS Adventure (1809)
• HMS Adventure (1904)
• HMS Adversary
• HMS Advice (1650)
• HMS Advice (1698)
• HMS Advice (1712)
• HMS Advice (1745)
• HMS Advice (1779)
• HMS Advice Prize
• HMS Aeolus (1801)
• HMS Africaine (1800)
• HMS Africaine (1801)
• HMS Afrikander
• HMS Afrikander II
• HMS Agate
• HMS Aggressor
• HMS Agile
• HMS Aid
• HMS Aid (1809)