El gouache o aguada (del galicismo gouache que puede derivar del italianismo guazzo) es una técnica pictórica que consiste diluir el color en agua sola o con diversos ingredientes, como goma, miel, etc. También es la pintura realizada con esta técnica. Las aguadas son acuarelas opacas, distintas de las acuarelas realizadas sobre papeles brillantes. La transparencia del papel se consigue a partir de la mayor o menor intensidad de los baños de colores que se apliquen a los objetos que se pretende representar. A partir de los tres colores primarios, sin mezclar con blanco ni negro, se pueden conseguir innumerables colores.

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Gouache (/ɡuːˈɑːʃ, ɡwɑːʃ/; French: [ɡwaʃ]), body color, opaque watercolor, or guache, is one type of watermedia, paint consisting of pigment, water, a binding agent (usually dextrin or gum arabic), and sometimes additional inert material. Gouache is designed to be used with opaque methods of painting. The term, derived from the Italian guazzo, also refers to paintings using this opaque method. Gouache has a considerable history going back over 600 years. It is similar to watercolor because it can be rewet and the paint can become infused with its paper support. It can also form a superficial layer like acrylic or oil paint. Also like watercolor, gouache dries to a matte finish. It is similar to acrylic or oil paints in that it is normally used in an opaque painting style. Many manufacturers of watercolor paints also produce gouache and the two can easily be used together.

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