Tan or TAN may refer to:

• Tan (color), pale shade of brown
• Tangent function, or tan, one of the main trigonometric functions

Midrash Tanhuma (Hebrew: מדרש תנחומא) is the name given to three different collections of Pentateuch aggadot; two are extant, while the third is known only through citations. These midrashim, although bearing the name of R. Tanḥuma, must not be regarded as having been written or edited by him. They were so named merely because they consist partly of homilies originating with him (this being indicated by the introductory formula "Thus began R. Tanḥuma" or "Thus preached R. Tanḥuma") and partly of homilies by aggadic teachers who followed the style of R. Tanḥuma. It is possible that R. Tanḥuma himself preserved his homilies, and that his collection was used by the editors of the midrash. The three collections were edited at different times; they will, therefore, be treated in chronological order.

Thunderbirds are Now! were a Livonia, Michigan-based post-punk revival band whose sound used a mix of traditional post-punk, new wave and noise rock. The band was heavily influenced by 1980s new wave and other post-punk revival acts like Les Savy Fav. They were signed to French Kiss Records, with an additional two releases on Action Driver Records and one self-released album.

In mathematics, the trigonometric functions (also called the circular functions) are functions of an angle. They relate the angles of a triangle to the lengths of its sides. Trigonometric functions are important in the study of triangles and modeling periodic phenomena, among many other applications.