Vassa is the three-month annual retreat observed by Theravada Buddhists. Taking place during the wet season, Vassa lasts for three lunar months, usually from July to October.

The meaning of a spiritual retreat can be different for different religious communities. Spiritual retreats are an integral part of many Buddhist, Christian and Sufi communities. There are many different types of spiritual retreats such as wellness retreats, mindfulness retreats, spa retreats, adventure retreats, detox retreats, yoga retreats, and religious retreats.