Wild at Heart: Discovering the Secret of a Man's Soul is a book by John Eldredge published in 2001, on the subject of the role of masculinity in contemporary evangelical Christian culture and doctrine.

Eldredge claims that men are bored, fear risk, and fail to pay attention to their deepest desires.

Eldredge frames the book around his outdoor experiences and anecdotes about his family and references elements of pop culture such as Braveheart, James Bond, Gladiator, and Indiana Jones, and lyrics from songs.

Eldredge describes the journey of healing and restoration that God wants to take every man on so that they can begin to live life the way he intended for them: freely, and from their regenerated masculine heart.

Eldredge points to the desire that most men have for exploration, creativity, and risk-taking as uniquely masculine and a reflection of the heart of God.

He points to the damsel in distress trope in popular storytelling, where a beautiful woman needs rescuing in some fashion, whether it is from a dragon or a wicked stepmother or from fear and hopelessness.

Chuck Swindoll, a radio evangelical pastor, called it "the best, most insightful book I have read in at least the last five years.

[5] Some have pointed out that the leader of the "pseudo-evangelical" cult and criminal organization La Familia cartel in Mexico, who refer to their assassinations and beheadings as '"divine justice", has made Eldredge’s book Wild at Heart required reading for La Familia gang members and has paid rural teachers and National Development Education members to circulate Eldredge's writings throughout the Michoacán countryside.