Len Duncan

{{Infobox F1 driver

| name = Len Duncan

| nationality = {{flagicon|USA}} American

| birth_date = {{birth date|1911|7|25}}

| birth_place = Brooklyn, New York

| death_date = {{death date and age|1998|8|1|1911|7|25}}

| death_place = Lansdale, Pennsylvania

| Years = {{F1|1953}}–{{F1|1956}}

| Team(s) = Kurtis Kraft, Schroeder

| Races = 4 (1 start)

| Championships = 0

| Wins = 0

| Podiums = 0

| Points = 0

| Poles = 0

| Fastest laps = 0

| First race = 1953 Indianapolis 500

| First win =

| Last win =

| Last race = 1956 Indianapolis 500

}}

Len Duncan (July 25, 1911 Brooklyn, New York – August 1, 1998 Lansdale, Pennsylvania) was an American race car driver. Duncan raced midget cars in seven decades from 1920s until the 1980s. During World War II, received the honor of being assigned as President Harry S. Truman's driver during one of his visits to England. Mario Andretti credits Duncan with having a great influence on his professional life. Andretti raced against Duncan in the American Racing Drivers Club (ARDC) series in 1963.