Megacraspedus pusillus is a moth of the family Gelechiidae. It was described by Thomas de Grey, 6th Baron Walsingham, in 1903. It is found in Spain.
The wingspan is . The forewings are brownish grey, dusted with pale cinereous and devoid of markings, with the exception of a small blackish spot at the end of the cell. The hindwings are pale grey.