Momoyo Kaijima (born 1969) is a Japanese architect and co-founder of Atelier Bow-Wow, a firm known for its innovative urban research and contextual architecture. Alongside Yoshiharu Tsukamoto, she has developed the concept of "Behaviorology", exploring the interaction between people, buildings, and environments. Her notable works include Pet Architecture, small-scale urban structures that adapt to Tokyo’s dense landscape. Kaijima’s research-driven design philosophy extends into academia, where she has taught at ETH Zurich and Harvard GSD. Through her work, she continues to shape contemporary architecture with a focus on adaptability, urban dynamics, and human-centric design.