Nanayakkarapathirage Martin Perera, commonly known as Dr. N. M. Perera, was one of the leaders of the Sri Lankan Trotskyist Lanka Sama Samaja Party (LSSP). He was the first Trotskyist to become a cabinet minister. He served two terms as Minister of Finance and Leader of the Opposition, as well as one term as the Mayor of Colombo.

The Lanka Sama Samaja Party, often abbreviated as LSSP, is a major Trotskyist political party in Sri Lanka. It was the first political party in Sri Lanka, having been founded in 1935 by Leslie Goonewardene, N.M. Perera, Colvin R. de Silva, Philip Gunawardena and Robert Gunawardena. It currently is a member of the main ruling coalition in the government of Sri Lanka and is headed by Tissa Vitharana. The party was founded with Leninist ideals, and is classified as a party with socialist aims.