La Petite Poissonnerie is a French-run restaurant and fishmonger in Marylebone, London, selling oysters and seafood. Its menu centres on cold seafood platters and oysters, along with squid ink dishes and steamed mussels. It is a 20-minute walk from Marylebone station, and seating is split between an upstairs floor, a basement and a counter. Reservations are recommended, and portions are on the small side.