The ninth multidisciplinary workshop on advances in preferences handling has been organized by Darius Braziunas, Markus Endres, K. Brent Venable, Paul Weng, and Lirong Xia in Buenos Aires, Argentina on July 27, 2015, in conjunction with IJCAI 2015. The workshop has been held jointly with the workshop on intelligent personalization. The combined program featured two invited talks and fourteen presentations. The talks related to preference handling covered topics such as preference elicitation, conditional preferences, and preferences in data-bases.