Hyacinth Bernard Wenceslaus Morgan (11 September 1885 - 7 May 1956) was a Labour Party politician in the United Kingdom. He was a Member of Parliament (MP) from 1929 to 1931, and 1940 to 1955.

He was born in the West Indies, to poor Irish parents and came to the United Kingdom to study medicine at Glasgow University in 1904. while at University he was active in the Fabian Society and founded a students Irish Nationalist Club.

After qualifying, he worked in a number of Glasgow mental hospitals and then served as a doctor in France during World War I, and then entered general practice in London, initially at Greenwich, later Camberwell and finally at Paddington.