This paper aims to study instrumental related functions in some Western Iranian languages. The data were collected from descriptive grammars, and interviews in some cases. Narrog’s instrumental semantic map is the basis for analyzing polysemy patterns in these languages. The data show that two main polysemy patterns are attested: (1) Instrumental and companion functions are coded alike. (2) They are coded differently. These two patterns are distributed areally. Furthermore, some languages are shifting/have shifted between these two types mainly as a result of contact-induced matters. In languages in which two or more functions are not directly connected, one marker generally has both instrumental and dative functions.
