Theoria: A Swedish Journal of Philosophy and Psychology is a peer-reviewed academic journal publishing research in all areas of philosophy established in 1935 by Åke Petzäll (sv).

It is published quarterly by Wiley-Blackwell on behalf of Stiftelsen Theoria.

Theoria publishes articles, reviews, and shorter notes and discussions.

Among the contributions to philosophy, logic, and mathematics first published in Theoria are:

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