At the manufacturing of champagne, the term "assemblage" refers to the blending of different grape varieties, vintages and/or crus (vineyard locations) to create a final cuvée or blend of champagne.

The assemblage is a crucial step in the champagne production process, as it allows the winemaker to create a consistent style and flavour profile for his champagne from year to year, despite variations in the quality of the grapes harvested each vintage.

The winemaker tastes and evaluates the different base wines (wines made from individual grape varieties and vineyard locations) and then uses his expertise to create a final blend that achieves the desired style and quality. This process can take weeks or even months, as the winemaker may make several tasting blends before arriving at the final assemblage.

The assemblage is an important factor in determining the quality and character of a champagne, and is an important part of the craftsmanship and tradition of champagne making.