衞星（Satellite），又寫做衛星，係圍住行星轉嘅天體，佢嘅運行軌道係封閉嘅圈，而唔係開口嘅雙曲線（Natural Satellite）同埋人造衞星（Man-made Satellite）兩種。單純喺技術角度嚟睇，圍住恆星轉嘅行星，甚至乎圍住銀河系中心轉嘅恒星都有可能會叫做「衞星」。不過啲人經常講嘅「衞星」係指圍住行星轉嘅天體，有時亦都可能指矮行星同埋小行星。
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