Louis Marchand (February 2, 1669 – February 17, 1732) is a French Baroque organist, harpsichordist, and composer.

Born into an organist's family, Marchand is a child prodigy and quickly establishes himself as one of the best known French virtuosi of his time.

He works as organist of numerous churches and, for a few years, at the French court.

Marchand has a violent temperament and an arrogant personality, and his life is filled with scandals, publicized and widely discussed both during his lifetime and after his death.

Despite his fame, few of his works survive to this day, and those that do almost all date from his early years.

Nevertheless, a few pieces of his, such as the organ pieces Grand dialogue in C and Fond d'orgue in E minor, have been lauded as classic works of the French organ school.