Las Colonias was a census-designated place (CDP) in Zavala County, Texas, United States.

Prior to the 2010 census, parts of this former CDP were used to create the new Amaya and Loma Grande CDPs.

Las Colonias was first listed as a census designated place prior to the 2000 U.S.

[15] It was deleted prior to the 2010 U.S. Census with parts of its territory used to form the Amaya CDP and Loma Grande CDPs.

Las Colonias was served by the Crystal City Independent School District.