This is the first book exclusively devoted to phenomenology and quantum mechanics. By emphasizing the role of the subject’s experiences, QBism exhibits several interesting parallels with phenomenology. This book elaborates whether and specifies how phenomenology could serve as thephilosophical foundation of QBism. This objective is pursued from the perspective of QBists engaging with phenomenology as well as the perspective of phenomenologists engaging with QBism. These approaches enable us to realize a better understanding of quantum mechanics and the world we live in, achieve a better understanding of QBsim, and introduce the phenomenological foundations of quantum mechanics.