Christos Theofilou (Greek: Χρήστος Θεοφίλου; January 2, 1894 – August 19, 1975), better known as "The Golden Greek" Jim Londos (Greek: Τζιμ Λόντος), was a Greek American professional wrestler. Londos was one of the most popular stars on the professional wrestling circuit from the 1920s through the 1940s and the first immigrant to be an athletic superstar in the United States.

Jim Londos was born Christos Theofilou in 1894 in Koutsopodi, Argos, Greece as the youngest of thirteen children of Theophilos Theofilou and Panagoula Bimbos, though six died between the births of Londos and his next youngest brother. He worked on the family farm, tending to chores and was a middling student and not particularly outstanding young man.

At age 15, he emigrated to the United States with a cousin in search of adventure and to escape what he called his father's "stern" ways. He sailed for three weeks in steerage class aboard a steamship before landing at Ellis Island on October 10, 1909. He worked his way across the country by riding the rails. In Chicago, he shared an apartment with two friends from Greece and picked up his love of wrestling by watching amateur wrestling at a gymnasium in a resettlement complex. He also worked on a railroad in Utah before relocating to San Francisco, where his cousin lived.

In San Francisco, Londos worked a succession of odd jobs as a railroad boy, an electrician's apprentice, and a bus boy. He joined the San Francisco YMCA and quickly became one of the top amateur wrestlers on the West Coast, winning AAU and regional championships. He decided to turn pro in 1914 despite rejection from his father, who considered professional wrestling to be undignified and cut off communications with his son.

At first, Londos wrestled under his Theophelos name, as well as Young Santell and Syrian Jim Wilson. With input from an Oregon sports editor, he changed his name to Jim Londas and then Jim Londos, saying it was easier to pronounce. The disguise also hid his wrestling from his family.

Londos labored for years to break through to the top of his profession, but at 5'8", he was considered too small and too Greek to be the most important figure in wrestling. He failed in nearly a dozen tries to wrest the world title from Ed "Strangler" Lewis, Dick Shikat and Joe Stecher. During a 1928 trip to Greece, the first time he had been there in 18 years, he saw how much faith his country men and women had in him, and vowed to win the world title for them and for his father.

After a series of inter-promotional fights, Londos squared off again with Shikat for a version of the world championship on July 3, 1930, in Philadelphia under the promotion of Ray Fabiani. Londos won the match and altered the standard of a wrestling champion, defending his title 120-130 times a year before the largest crowds the sport had ever seen. Promoters ran just three shows in Madison Square Garden in the 20 months prior to Londos' championship win, averaging less than 3,200 fans. Londos immediately started selling out the Garden, drawing 20,000 against a variety of opponents. He became the greatest drawing card wrestling had ever seen.

Londos was an active and popular champion who introduced the sleeper hold into wrestling and popularized the airplane spin as a finishing move. His first reign as world champion was marked by a running Cold War feud with Lewis, though they did not wrestle between 1924 and 1934, in part because they were in opposing camps. Londos also was the victim of a double-cross in a 1933 match with Joe Savoldi that cost him his championship claim in some jurisdictions when a referee counted him down even though his shoulder was off the mat.