Frank Lucius Packard (February 2, 1877 - February 17, 1942) was a Canadian novelist. He was born in Montreal, Quebec and as a young man went to work as a civil engineer for the Canadian Pacific Railway. His experiences working on the railroad led to his writing a series of mystery novels.

In "The Sin That Was His" a crook falsely accused of a murder disguises himself as a priest in order to escape the police, but in living out his second disguised life undergoes a spiritual and moral change.