Jacoba Johanna (Coba) Ritsema (26 June 1876, Haarlem - 13 December 1961, Amsterdam), was a portrait painter from the Netherlands.
Together with eight other artist friends, she founded an artists' association, which was introduced by the art critic Albert Plasschaert as the Amsterdam Joffers. The group of female artists contributed significantly to the acceptance of women in art at that time.
Jacoba, or Coba, was born in 1876 as the daughter of the book printer Coenraad Ritsema and his wife Jeanette (Jannetje) Moulijn in an artistic family with one sister and two brothers.
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