Selius Marselis (15 December 1600 – 20 March 1663) was a Dutch-born Norwegian tradesman.

He was also a major land owner whose possessions included ownership of Frogner Manor.

He settled in Christiania (now Oslo) in 1644 after he was granted a number of special privileges.

In time, he and his brother Gabriel Marselis became the largest property owners in Norway.

[3] Selius Marselis married into one of the larger Dutch merchant families.