Makry Gialos (Greek: Μακρύ Γιαλός) is a former municipality in Lasithi, Crete, Greece, with a population 3,894 in 2011. It is located on the south-east coast of Crete.
Since the 2011 local government reform it is part of the municipality Ierapetra, of which it is a municipal unit. The municipal unit has an area of 159.229 km2 (61.479 sq mi). The seat of the municipality was in Koutsouras, 22 kilometers east of Ierapetra. It was established in 1998 when the communities of Schinokapsala, Orino, Stavrochori, Chrisopigi, Aghios Stefanos, Pefki, Lithines and Pervolakia amalgamated into one municipality (Δήμος).
The name Makry Gialos - or, alternatively, Makry-Gialos, Makrygialos, Makriyialos, or Makrigialos - is also specifically given both to a village and tourist centre on the coast within the municipality, and to the nearby archaeological site of an ancient Minoan country house.