Agnostic theism is the philosophical view that encompasses both theism and agnosticism. An agnostic theist believes in the existence of at least one deity, but regards the truth or falsehood of this proposition as unknown or inherently unknowable. The agnostic theist may also or alternatively be agnostic regarding the properties of the God(s) they believe in.

There are numerous beliefs that can be included in agnostic theism, including fideism, however not all agnostic theists are fideists. Since agnosticism is a position on knowledge and does not forbid belief in a deity, it is compatible with most theistic positions.

The classical philosophical understanding of knowledge is that knowledge is justified true belief. By this definition, it is reasonable to assert that one may hold a belief, and that belief may be true, without asserting that one knows it. The founder of logotherapy, Viktor Frankl, may have well exemplified this definition. Seidner expands upon this example and stresses Frankl's characterization of unconscious. Agnostic theism could be interpreted as an admission that it is not possible to justify one's belief in a god sufficiently for it to be considered known. This may be because they consider faith a requirement of their religion, or because of the influence of plausible-seeming scientific or philosophical criticism.