Mathiesen is a Norwegian family of Danish origin, whose members have been noted as timber magnates, land-owners and businessmen.
[1] The progenitor is the merchant Jørgen Mathiesen from Copenhagen (died 1656).
His grandson Jørgen Mathiesen (1663–1742) settled in Norway, where he became bailiff in Helgeland.
His descendants became timber merchants, and were co-owners of Tostrup & Mathiesen from 1842.
The family also owned Linderud Manor in Oslo.