In classical architecture, an architrave (/ˈɑːrkɪˌtreɪv/; from Italian architrave 'chief beam'), also called an epistyle (from Ancient Greek ἐπίστυλον (epístulon) 'on the column'), is the lintel or beam, typically made of wood or stone, that rests on the capitals of columns.

The term can also apply to all sides, including the vertical members, of a frame with mouldings around a door or window. The word "architrave" has come to be used to refer more generally to a style of mouldings (or other elements) framing a door, window or other rectangular opening, where the horizontal "head" casing extends across the tops of the vertical side casings where the elements join (forming a butt joint, as opposed to a miter joint).

In an entablature in classical architecture, it is the lowest part, below the frieze and cornice. The word is derived from the Greek and Latin words arche and trabs combined to mean "main beam". The architrave is different in the different Classical orders. In the Tuscan order, it only consists of a plain face, crowned with a fillet, and is half a module in height. In the Doric and Composite order, it has two faces, or fasciae, and three in the Ionic and Corinthian order, in which it is 10/12 of a module high, though but half a module in the rest.

The term architrave has also been used in academic writing to mean the fundamental part of something (a speech, a thought or a reasoning), or the basis upon which an idea, reasoning, thought or philosophy is built.

Examples:

In modern architecture and interior design, the term architrave also refers to the mouldings that frame doors and windows. Unlike classical architraves, which were primarily structural and often ornate, modern architraves are typically decorative and functional, concealing the gap between the wall and the door or window frame.

Modern architraves are commonly made from:

Modern architraves are available in a variety of styles to suit different interior design preferences: