Bulk metallic glasses are unique materials that exhibit an amorphous glassy atomic structure, which is different from their counterparts' crystalline materials with well-ordered atomic arrangements. The amorphous structure of BMGs can give them distinct mechanical properties compared to crystalline materials. The Poisson ratio (ν) can vary widely depending on various factors of the BMG alloy, such as composition, cooling rate, alloying element and their fraction, atomic structure, processing condition, etc.