韧带（拉丁语 Ligamenta，单数 Ligamentum）是可弯曲，纤维样的弹性结缔组织。

韧带连接骨与骨，为明显的纤维组织，或附于骨的表面或与关节囊的外层融合，以加强关节的稳固性，以免损伤，相对肌腱连接的是骨和肌肉；韧带还是支持内脏，富有坚韧性的纤维带，多为增厚的腹膜皱襞，使内脏固定于正常位置或限制其活动范围；此外还有为某些胚胎器官的残存遗迹，如动脉导管韧带。

韧带来自于胶原。若韧带超过其生理范围地被弯曲（如扭伤），可以导致韧带的延长或是断裂。

在生物学中，贝壳类动物连接两片壳的组织也被称为韧带。

In anatomy, a ligament is the fibrous connective tissue that connects bones to other bones and is also known as articular ligament, articular larua, fibrous ligament, or true ligament.

Ligament can also refer to:

The study of ligaments is known as desmology (from Greek δεσμός, desmos, "bond"; and -λογία, -logia).