Mochlus grandisonianus, also known commonly as Lanza's writhing skink, is a species of lizard in the family Scincidae.

[2] The specific name, grandisonianus, is in honor of British herpetologist Alice Georgie Cruickshank "Bunty" Grandison.

[3] M. grandisonianus is found in northeastern Somalia, where it has been found in Bari region and Mudug region.

[1] The preferred natural habitat of M. grandisonianus is sand.

[1] The mode of reproduction of M. grandisonianus is unknown.