Abstract: In this study, we propose the theory of fuzzy parameterized intuitionistic fuzzy soft expert set theory and define some related concepts pertaining to this notion as well as the basic operations on this concept, namely the complement, union, intersection AND and OR. The basic properties and relevant laws pertaining to this concept such as the De Morgan’s laws are proved. Lastly, a generalized algorithm is introduced and applied to the proposed concept of fuzzy parameterized intuitionistic fuzzy soft expert sets in a hypothetical decision making problem.