O-class submarine

O-class submarine may refer to:

• {{sclass2|United States O|submarine|1}}
• {{sclass|Oberon|submarine|1}}
• {{sclass|Odin|submarine|1}}
• Several early submarine classes of the Royal Netherlands Navy:
• : O 1-class submarine consisting only {{HNLMS|O 1}}
• : {{sclass|O 2|submarine|1}}
• : O 6-class submarine consisting only {{HNLMS|O 6}}
• : O 7-class submarine consisting only {{HNLMS|O 7}}
• : {{sclass|O 9|submarine|1}}
• : {{sclass|O 12|submarine|1}}
• : O 16-class submarine consisting only {{HNLMS|O 16}}
• : {{sclass|O 19|submarine|1}}
• : {{sclass|O 21|submarine|1}}

{{disambiguation page}}