全在（英语：Omnipresence或 ubiquity ），又译遍在，指能够出现在任何地方的能力。这通常使用于宗教文本中，被当成是神祇拥有的能力之一。一神教中的唯一神，通常被认为具备有这种属性。但这个概念与泛神论不同，泛神论将宇宙整体视为一个神祇，宇宙的任意地方都是神的一部分；但是具备全在能力的神，神与宇宙是分开的个体，神可以出现在宇宙的任意地方。

Omnipresence or ubiquity is the property of being present everywhere. This property is most commonly used in a religious context as an attribute of a deity or supreme being.

The omnipresence of a supreme being is conceived differently by different religious systems. In monotheistic beliefs like Christianity, Judaism, and Islam the divine and the universe are separate, but the divine is present everywhere. In pantheistic beliefs the divine and the universe are identical. In panentheistic beliefs the divine interpenetrates the universe, but extends beyond it in time and space.