Multi-Fuzzy Sets is an introductory text on multi-fuzzy sets written with minimal prerequisites. It is a study of multi-fuzzification of crisp sets, multi-level fuzziness and multi-dimensional fuzziness. The concept of multi-fuzzy sets is a generalization of Zadeh's fuzzy sets and Atanassov's intuitionistic fuzzy sets. The book offers a concise account of various topics such as multi-fuzzy sets, multi-fuzzy topology, multi-fuzzy subgroups, multi-fuzzy logic, Atanassov intuitionistic fuzzy sets generating maps, strong L-fuzzy sets, etc. It covers multi-dimensional characterization problems in image processing, taste recognition and uncertainty.