This doctoral thesis identifies and provides original descriptive accounts of two schools of thought in the philosophy of beauty: (i) the 20th-century ‘Anti-Aesthetic’ movement and (ii) the 21st-century ‘Beauty-Revival’ movement. I argue that the Anti-Aesthetic movement is devoted to a decisive negation of beauty—denying its importance as a philosophical notion and its significance as a lived experience. The Beauty-Revival movement affirms the value of beauty as a philosophical notion and as a lived aesthetic experience. Corresponding to these commitments, the Anti-Aesthetic and Beauty-Revival movements engage largely incompatible philosophical notions of beauty, which this dissertation constructs and places in parallel with one another. Th...