Casetón o, a veces, caseto (del latín capsa, arcón, cajón) es un término arquitectónico que designa cada uno de los adornos huecos geométricos (como cuadrados, rectángulos u octógonos) que se disponen en forma regular (parecido a un tablero de ajedrez) en un techo o en el interior de una bóveda. Es una técnica ya utilizada en la antigüedad clásica: un ejemplo típico se da en el Panteón de Agripa o la Basílica de Majencio. Posteriormente, se puso de nuevo de moda, principalmente, durante el Renacimiento y el Barroco y más tarde en el Neoclasicismo. Observando un techo o una cúpula que contiene casetones, a menudo da la impresión que está atravesado por vigas o molduras que se entrecruzan en las esquinas. Esta estructura no sólo está justificada por razones estéticas, sino que los casetones pueden utilizarse además para reducir el peso de una cúpula, como en el caso del Panteón de Roma. Los casetones suelen estar decorados por ejemplo con típicos rosetones e incluso pintados como trampantojos. En la construcción moderna se les llama casetones a las piezas, de forma cúbica o prismática rectangular, que sirven a manera de encofrado o cimbra para dar forma a las losas reticulares, o forjados bidireccionales.

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A coffer (or coffering) in architecture, is a series of sunken panels in the shape of a square, rectangle, or octagon in a ceiling, soffit or vault. A series of these sunken panels were used as decoration for a ceiling or a vault, also called caissons ('boxes"), or lacunaria ("spaces, openings"), so that a coffered ceiling can be called a lacunar ceiling: the strength of the structure is in the framework of the coffers. The stone coffers of the ancient Greeks and Romans are the earliest surviving examples, but a seventh-century BC Etruscan chamber tomb in the necropolis of San Giuliano, which is cut in soft tufa-like stone reproduces a ceiling with beams and cross-beams lying on them, with flat panels filling the lacunae. For centuries, it was thought that wooden coffers were first made by crossing the wooden beams of a ceiling in the Loire Valley châteaux of the early Renaissance. In 2012, however, archaeologists working under Andrew Wallace-Hadrill at the House of the Telephus in Herculaneum discovered that wooden coffered ceilings were constructed in Roman times. Experimentation with the possible shapes in coffering, which solve problems of mathematical tiling, or tessellation, were a feature of Islamic as well as Renaissance architecture. The more complicated problems of diminishing the scale of the individual coffers were presented by the requirements of curved surfaces of vaults and domes. A prominent example of Roman coffering, employed to lighten the weight of the dome, can be found in the ceiling of the rotunda dome in the Pantheon, Rome. In ancient Chinese wooden architecture, coffering is known as zaojing (Chinese: 藻井; pinyin: zǎojǐng).

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