Gregoire Johannes Boonzaier OMSS (31 July 1909 – 22 April 2005) was a South African artist well known for his landscapes, portraits and still life paintings.

Early on Gregoire made the acquaintance of the artists Pieter Wenning, Nita Spilhaus, Moses Kottler and Anton van Wouw, all of whom were close family friends.

It was Moses Kottler who first gave Gregoire a box of paints in 1922 and Nita Spilhaus an easel in 1926, igniting a creative flame that was to burn for more than eighty years.

His early paintings having been strongly influenced by Pieter Wenning, he now absorbed the work of Van Gogh, Cézanne, Utrillo and Braque, and made trips as far afield as Russia, where his socialist leanings are reinforced.

Boonzaier made Cape Town his base and his subsequent work reflected views of District Six and the Malay Quarter, recording its colourful life.