The Good Soldier: A Tale of Passion is a 1915 novel by English novelist Ford Madox Ford. It is set just before World War I and chronicles the tragedies of the lives of two seemingly perfect couples. The novel is told using a series of flashbacks in non-chronological order, a literary technique pioneered by Ford. It also makes use of the device of the unreliable narrator, as the main character gradually reveals a version of events that is quite different from what the introduction leads you to believe. The novel was loosely based on two incidents of adultery and on Ford's messy personal life.

The novel's original title was The Saddest Story, but after the onset of World War I, the publishers asked Ford for a new title. Ford suggested (perhaps sarcastically) The Good Soldier, and the name stuck.