Maria Catharina Wiik was a Finnish painter.
She worked principally with still life, genre, landscape paintings and portraits.
Wiik was born in Helsinki.
She was the daughter of architect Erik Johan Wik (or Wiik) (1804-1876) and his wife Gustava Fredrika Meyer.
She was born and grew up in Brunnsparken and attended the Swedish language school Svenska fruntimmersskolan in Helsingfors. She then studied drawing with art professor Adolf von Becker.
Encouraged by her family, she studied art during 1874-1875 at the Academy of Fine Arts in Helsinki.