Lineodes triangulalis is a moth in the Crambidae family. It was described by Möschler in 1890. It is found in Cuba, Puerto Rico, Jamaica, Dominica, the Bahamas, Mexico, Honduras, Guatemala, Colombia, Trinidad and Venezuela. In the United States it has been recorded from Florida and Texas. The length of the forewings is 7.7-9.7 mm. The wings are dark brown with narrow white medial and antemedial areas. The larvae have been reared on the leaves of Capsicum frutescens.