Abstract: The prefabricated plumbing connection for a sink is a pre-plumbed cabinet that is adapted for use with sinks. The prefabricated plumbing connection for a sink is a structure that provides pre-fitted piping that can be used in the installation of a sink. Specifically, the plumbing fittings of the sink are connected directly to the prefabricated plumbing connection for a sink and the house plumbing connections are also connected directly to the prefabricated plumbing connection for a sink. This reduces the number of connections required to install a sink and eliminates the need of the cutting and fitting of pipes. The prefabricated plumbing connection for a sink comprises an encasement, a drain pipe, a hot water feed, and a cold water feed.