A lascar was a sailor or militiaman from the Indian subcontinent, Southeast Asia, the Arab world, British Somaliland or other lands east of the Cape of Good Hope who was employed on European ships from the 16th century until the mid-20th century.

Lascarins is a term used in Sri Lanka to identify indigenous soldiers who fought for the Portuguese during the Portuguese era (1505–1658) and continued to serve as colonial soldiers until the 1930s. The lascarins played a crucial role not only in the colonial armies, but also in the success of the campaigns of the local kingdoms.