Content and Consciousness (1969)This one of Dennet's first, and most notable books he published. In the book, Dennett examined the relationship between how the body and the brain interact. He attempted to create a theory between consciousness and the human mind. This was the book he first introduced his theory of consciousness and his theory of mental consent.
Dennett, Daniel C. Content and Consciousness. Humanities Press, 1969.
Brainstorms (1978)In this book, Dennett discusses his ideas of free will and consciousness. He uses his experiments and arguments in an attempt to expose hobbling institutions. He also discussed his beliefs on artificial intelligence and his thought that AI is just a "slave" to humanity.
Dennett, Daniel C. Brainstorms: Philosophic Essays on Mind and Psychology. Bradford Books, 1978.
Darwin's Dangerous Idea (1995)In the book, Dennett outlined his views of evolution. He broke down his reasoning on why he believes in adaptationism is the correct explanation for evolution. He also laid out his claim that morality originated as a byproduct of evolution.
Dennett, Daniel C. Darwin's Dangerous Idea. Simon & Schuster, 1995.
TED Talk (2003)Attached is a link to a TED talk Daniel Dennett participated in discussing consciousness.
From Bacteria to Bach and Back: The Evolution of Minds (2017)In one of Dennett's most recent books, he discussed in detail how to better understand the evolution of consciousness and the mystery behind this evolution. This is also the book when he made the somewhat controversial reference to evolution in biological genes being similar to the cultural transmission of memes.
Dennett, Daniel C. From Bacteria to Bach and Back: The Evolution of Minds. W. W. Norton & Company, 2017.