Joseph Thomas Last (1849, Tuddenham- 1933, Shortlands) was an English missionary, explorer and naturalist.
He briefly returned to Britain and then in 1877 he was appointed to the Usagara Mission at Mpwapwa.
Later he was associated with Royal Geographical Society and the Imperial British East Africa Company.
He visited Portuguese East Africa in 1885, explored the Namuli Mountains and discovered the caves at Mangapwani in Zanzibar.
Last made important collections of African Lepidoptera and Mollusca.