Apatheism (/ˌæpəˈθiːɪzəm/ a portmanteau of apathy and theism/atheism), also known as pragmatic atheism or practical atheism, is acting with apathy, disregard, or lack of interest towards belief or disbelief in a deity or deities.

An apatheist is someone who is not interested in accepting or denying any claims that gods exist or do not exist. An apatheist lives as if there are no gods and explains natural phenomena without reference to any deities. The existence of gods is not rejected, but may be designated unnecessary or useless; gods neither provide purpose to life, nor influence everyday life, according to this view.