Mathiasen is a Danish-Norwegian patronymic surname meaning "son of Mathias" (equivalent of the Biblical Μαθθαιος, cf. English Matthew). Several spelling variants are used, including Matthiasen and Matthiassen. A similar diversity of forms exist for the parallel given name Mathies/Mathis. Though not a hard and fast rule, generally spellings with a single s are Danish and a double ss are Norwegian.There are several people with the surname Mathiasen:
Matthiasen may refer to:
Mathiassen may refer to: