In geography, an arm is a narrow extension, inlet, or smaller reach, of water flowing out from a much larger body of water, such as an ocean, a sea, or a lake. Although different geographically, a sound or bay may also be called an arm.

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Both the tributary and distributary of a river are sometimes called an "arm". By extension, a canal arm is a subsidiary branch of a canal or inland waterway. A number of place names are derived from this term, such as Salmon Arm, Indian Arm and Alice Arm.

• Anabranch
• River
• Channel
• Indian Arm
• Alice Arm
• Gulf of Bothnia