Commander Harry Lewin Lee Pennell (1882 – 31 May 1916) was a Royal Navy officer who served on the Terra Nova Expedition.
He only spent short periods in Antarctica, returning with the Terra Nova to wait out the winters of 1911 and 1912 in Lyttelton, New Zealand.
Due to the absence of Robert Falcon Scott on land, Pennell assumed the role of command on the Terra Nova, which would bring fresh supplies back to Antarctica with each voyage.
Herbert Ponting, the photographer of the expedition, recalled in his book The Great White South that Pennell was "the most energetic man I have ever known....when Pennell was not occupied with navigating problems, he was either on watch, or conning from the crow's-nest, or else out on the yard-arms helping the seaman set or shorten sail, or otherwise assisting in the handling of the ship.
'Pennell's yells were so frequent and ear-piercing that he became famous for them, and many times in working on the ropes in rough seas and big winds, we have been cheered by this unmusical noise over our heads.'