Bittiolum varium, common name the grass cerith, is a species of sea snail, a marine gastropod mollusk in the family Cerithiidae.
Bittiolum varium occurs in shallow waters ( depth) of the Western Atlantic between the East Coast of the United States (Maryland) and Brazil.
The maximum recorded shell length is 6.5 mm.
The minimum recorded depth for this species is 0 m; maximum recorded depth is 11 m.