John Tyree is a fictional character from the novel "Dear John," written by Nicholas Sparks. He is a young soldier in the United States Army, who is on leave when he meets Savannah Lynn Curtis, a college student. Their relationship develops during his time off, leading to a deep emotional connection. Throughout the story, John struggles with the challenges of military life and the impact it has on his relationship with Savannah. The narrative explores themes of love, sacrifice, and the complexities of long-distance relationships, ultimately shaping John's character and decisions.