Riikka Kantinkoski is a Finnish photographer, stylist and designer, who is known for her blog, Weekday Carnival, and crafts book, Ok – Omin käsin, written together with Susanna Vento.

After working for 14 years as a photographer for the Finnish media company A-lehdet she went on to start her business as a freelancer. Her clients include several brands and magazines in Finland and abroad. Kantinkoski also designs posters, jewellery and wall hangings under the name of RK Design.