SS Clan Macarthur was a British refrigerated cargo steamship. She was built for Cayzer, Irvine and Company's Clan Line Steamers Ltd as one of its Cameron-class steamships. She was launched in Greenock in 1936 and sunk in the Indian Ocean by enemy action in August 1943.This was the third Cayzer, Irvine ship to be named after Clan Arthur. The first was a 3,984 GRT ship built in 1883, sold to an Indian buyer in 1904 and renamed Shah Jehan.