Cosmopterix floridanella is a moth of the family Cosmopterigidae. It is found in the United States (Florida, Arkansas, Mississippi, Tennessee, Louisiana, Alabama), the Cayman Islands (Grand Cayman), Cuba, Jamaica and the US Virgin Islands (St. Croix). Adults have been collected from April towards May in the United States and from December to May in Jamaica, the Cayman Islands including the US Virgin Islands. There are at least two generations per year.