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Louis Unser Jr. (March 16, 1896 – October 18, 1979) was an American racing driver.^[1] He was the patriarch of the Unser family of American auto racers. He was renowned for his hill-climbing career, winning the Pikes Peak Hill Climb nine times between 1934 and 1953.

Unser is officially the oldest ever Indy car driver to have started a race. He raced the 1965 Pikes Peak Hill Climb at the age of 69 years 3 months and 19 days, however his record is often given to A. J. Foyt, who competed in the 1992 Indianapolis 500 at the age of 57 years 4 months and 8 days.

Unser is also the oldest Indy car winner. He won the 1953 Pikes Peak Hill Climb at the age of 57 years 5 months and 22 days,^[2] however his record is often given to Mario Andretti, who won at Phoenix in 1993 at the age of 53 years 1 month and 7 days.

Unser is buried at the Fairview Cemetery in Colorado Springs, Colorado.

• Pikes Peak Hill Climb Museum Hall of Fame (1997)^[3]

(key) (Races in bold indicate pole position)

• Unser (disambiguation) for other family members who were race car drivers