This book constitutes the refereed conference proceedingsof the 15th International Conference on Rough Sets, Fuzzy Sets, Data Mining andGranular Computing, RSFDGrC 2015, held in Tianjin, China in November 2015 asone of the co-located conference of the 2015 Joint Rough Set Symposium, JRS2015.

The 44 papers were carefully reviewed and selected from97 submissions. The papers in this volume cover topics such as rough sets: theexperts speak; generalized rough sets; rough sets and graphs; rough and fuzzyhybridization; granular computing; data mining and machine learning; three-waydecisions; IJCRS 2015 data challenge.