As masculinities are changing, taking a social identity perspective on men and their relations with others helps to understand how men navigate their social world. Combining this with other common approaches in the psychology of gender, men, and masculinities, we review how such a perspective helps to understand men’s differing health and well-being outcomes, work/family choices, and their responses to changing gender relations and other social developments (privilege, threat, allyship). In so doing, we emphasize that men’s audiences (i.e., who precisely is watching them) play a key role in shaping these outcomes as well. For practitioners working in the fields of health and well-being, work and family, or gender equality, we identify key implications that follow from the reviewed research. We end our review with suggestions for future research.