Gaja Grzegorzewska (born 11 May 1980 in Cracow) is a Polish novelist. She is the author of crime novels about a female private detective, Julia Dobrowolska: Żniwiarz, Noc z czwartku na niedzielę, Topielica ( in 2011) and Grób (2012). Finished VIII High School in Cracow and on Jagiellonian University.