Doctor at Sea is a 1955 British comedy film, directed by Ralph Thomas, produced by Betty E. Box, and based on Richard Gordon's 1953 novel of the same name.

Once again, Richard Gordon participated in the screenwriting, together with Nicholas Phipps and Jack Davies, and once again Dirk Bogarde played the lead character Dr Simon Sparrow.

To escape his employers' daughter, who has amorous designs on him, Dr. Simon Sparrow (Bogarde) signs on as medical officer on a cargo ship, the SS Lotus.

Captain Hogg is ordered to take on two female passengers, Muriel Mallet (De Banzie), the daughter of the chairman of the shipping company, and her friend Hélène for the return trip.

However, as they reach home port, Sparrow finds out that she has received a telegram offering her a job in Rio de Janeiro, which he had told her is the destination for his ship on its next trip.