Marcel Louis Robert Lanquetuit (8 June 1894 – 21 May 1985) was a French composer, organist, conductor, improviser and teacher of music.
Lanquetuit began his musical studies in his hometown under Albert Dupré, and then began learning the organ and music theory (harmony, counterpoint, fugue) privately with Albert's son Marcel Dupré.
In 1926, he made a recital tour of the United States, visiting New York City, Princeton and Philadelphia (where he played the famous Wanamaker Organ, by some measures the largest pipe organ in the world, in Wanamaker's department store).
He taught privately, and was the substitute for Marcel Dupré at the Paris Conservatory before the Second World War.
His reputation as a composer is based primarily on a Toccata in D major, published in 1927 by Éditions Alphonse Leduc.