Macajilayn, also spelled Mecajilayn, is a proto-Somali archaeological site located in the Sanaag region of Somaliland.

Macajilayn is situated to the east of the old coastal town of Heis.

[1] The site contains a number of cairns, from which excavations have yielded Roman and Nubian imports.

Based on these finds, the structures have been estimated to date between the 1st and 4th centuries CE.

[1] Additionally, along with Salweyn, Macajilayn is the only local site where specialized ancient disc-like monuments have been found.