* "The Philosophy of Art" (1968): This book is considered his magnum opus, a comprehensive and influential work on aesthetics. It explores various theories of art, its nature, value, and function.
* "Art and the Social Order" (1970): This book examines the relationship between art and society, discussing the social contexts in which art is created and consumed.
* "The Aesthetics of the Novel" (1973): This work focuses specifically on the nature and aesthetics of novels, analyzing their distinctive features and artistic qualities.
* "Classical Aesthetics: A Critical Introduction" (1980): Osborne explores the history of aesthetics, focusing on key figures and ideas from ancient Greece to the Enlightenment.
* "The Art of Conversation" (1988): A more accessible work that explores the philosophical and social aspects of conversation, highlighting its importance in human interaction.
Beyond these, he also wrote numerous articles and essays on aesthetics, art criticism, and philosophy.
Please note that this is not an exhaustive list of all his writings. For more details, you can consult online databases such as WorldCat or search for "Harold Osborne" in your preferred online library catalog.