Compacta capitalis is a moth in the family Crambidae. It was described by Augustus Radcliffe Grote in 1881. It is found in North America, where it has been recorded from Maryland to Florida, west to Texas and possibly Colorado, north to Illinois. The wingspan is about 35 mm. The forewings are white with a reddish-brown shading at the base and along the inner margin and two black discal spots, as well as an irregular subterminal line. There is a dark apical blotch on both wings. Adults are on wing from May to August.