Rodman Edward Serling (December 25, 1924 – June 28, 1975) was an American screenwriter and television producer best known for his live television dramas of the 1950s and his anthology television series The Twilight Zone. Serling was active in politics, both on and off the screen, and helped form television industry standards. He was known as the "angry young man" of Hollywood, clashing with television executives and sponsors over a wide range of issues, including censorship, racism, and war.

Serling was born on December 25, 1924, in Syracuse, New York, to a Jewish family. He was the second of two sons born to Esther (née Cooper, 1893–1958), a homemaker, and Samuel Lawrence Serling (1892–1945). Serling's father had worked as a secretary and amateur inventor before his children were born but took on his father-in-law's profession as a grocer to earn a steady income. Sam Serling later became a butcher after the Great Depression forced the store to close. Rod had an older brother, novelist and aviation writer Robert J. Serling.

Serling spent most of his youth 70 mi (110 km) south of Syracuse in Binghamton, New York, after his family moved there in 1926. His parents encouraged his talents as a performer. Sam Serling built a small stage in the basement, where Rod often put on plays (with or without neighborhood children). His older brother, writer Robert, recalled that, at the age of six or seven, Rod entertained himself for hours by acting out dialogue from pulp magazines or movies he had seen. Rod would often ask questions without waiting for their answers. On an hour trip from Binghamton to Syracuse, the rest of the family remained silent to see if Rod would notice their lack of participation. He did not, and he talked nonstop through the entire car ride.

In elementary school, Serling was seen as the class clown and dismissed by many of his teachers as a lost cause. His seventh-grade English teacher, Helen Foley, encouraged him to enter the school's public speaking extracurriculars. He joined the debate team and was a speaker at his high school graduation. He began writing for the school newspaper, in which, according to the journalist Gordon Sander, he "established a reputation as a social activist".

Serling was interested in sports, and excelled at tennis and table tennis. When he attempted to join the varsity football team, he was told he was too small at 5 ft 4 in (163 cm) tall.

Serling was interested in radio and writing at an early age. He was an avid radio listener, especially interested in thrillers, fantasy, and horror shows. Arch Oboler and Norman Corwin were two of his favorite writers. He also "did some staff work at a Binghamton radio station ... tried to write ... but never had anything published." He was accepted into college during his senior year of high school. However, the United States was involved in World War II at the time, and Serling decided to enlist rather than start college immediately after he graduated from Binghamton Central High School in 1943.

As editor of his high school newspaper, Serling encouraged his fellow students to support the war effort. He wanted to leave school before graduation to join the fight, but his civics teacher talked him into waiting for graduation. "War is a temporary thing," Gus Youngstrom told him. "It ends. Education doesn't. Without your degree, where will you be after the war?"

Serling enlisted in the United States Army the morning after high school graduation, following his brother Robert. He began his military career in 1943 at Camp Toccoa, Georgia, under General Joseph May Swing and Colonel Orin D. Haugen and served in the 511th Parachute Infantry Regiment of the 11th Airborne Division. He eventually reached the rank of Technician Fourth Grade (T/4). Over the next year of paratrooper training, Serling and others began boxing to vent aggression. He competed as a flyweight and had 17 bouts, rising to the second round of the division finals before being knocked out. He was remembered for his Berserker style, and for "getting his nose broken in his first bout and again in the last bout". He tried his hand at the Golden Gloves, with little success. On April 25, 1944, Serling received his orders and saw that he was being sent west to California. He knew that he would be fighting against the Empire of Japan rather than Nazi Germany. This disappointed him because he had hoped to help fight against Adolf Hitler. In May, he was assigned to the Pacific Theater in New Guinea and the Philippine islands.