經線，又叫子午線，係跟地球經度畫出嘅輔助線，每條都係連住南極同北極嘅大圓，長約莫2萬公里。
喺地球上面，經線嘅命名用英國格林尼治嘅本初子午線做零點，以東叫做東經幾多度，以西叫做西經幾多度，例如穿過香港嗰條經線叫做「東經廿二點三度」。
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