Lost in the Cosmos: The Last Self-Help Book is a mock self-help book by Walker Percy,[1] published in 1983 by Farrar Straus & Giroux.

Organized into roughly four sections that explore ideas of the self, Percy's thesis is that the social ills which plague society are a result of humanity's epic identity crisis.

As a result, persons are thrust into the predicament of finding a sign that 'places' themselves.

The book contains numerous essays, quizzes, and "thought experiments" designed to satirize conventional self-help texts while provoking readers to undertake a thoughtful contemplation of their existential situations and the search for meaning and purpose that could derive from such reflections.

According to Andrew Hoogheem, it is: The book is a favorite of prominent philosopher Peter Kreeft, of Boston College, and a lecture on the subject appears on his personal website.