自在（梵文：ईश्वर），音译伊湿伐罗，佛典用语。又作无碍、纵任，即自由自在，随心所欲，做任何事均无障碍。此为诸佛及上位菩萨所具之功德，故佛亦称自在人。

所具之自在力有下列不同种类:

1.菩萨所有的两种自在:

2.第八不动地以上菩萨所具有的四种自在:

3.五种自在:

4.如来法身具足八自在:

5.行六波罗蜜可成就十种自在:

Ishvara (Sanskrit: ईश्वर, Īśvara) is a concept in Hinduism, with a wide range of meanings that depend on the era and the school of Hinduism. In ancient texts of Indian philosophy, Ishvara means supreme soul, Brahman (Highest Reality), ruler, king or husband depending on the context. In medieval era texts, Ishvara means God, Supreme Being, personal god, or special Self depending on the school of Hinduism.