Dan L. Duncan (January 2, 1933 – March 29, 2010) was an American entrepreneur born in Center, Texas.

Duncan served in the United States Army from 1953 to 1955 where he was stationed in Germany with radio communications after the Korean War.

[4] In 1957, he went to work for Wanda Petroleum,[4] a midstream pipeline company[3] In 1968, he left Wanda, and with $10,000 and two propane delivery trucks, helped found Enterprise Products Co.[4] In 1998, he took Enterprise Products Partners LP public.

[10] Duncan donated a sculpture by Jean Dubuffet named "Monument au Fantôme" to Discovery Green Park near the George R. Brown Convention Center.

[11] Duncan was a Safari Club International member who has been given numerous awards for his hunting trophies.

He answered questions regarding a hunt in Russia in 2002 in which he shot and killed a moose and a wild sheep from a helicopter, which is illegal under Russian law.

His attorney said on September 12, 2007, that a grand jury had declined to bring charges against Duncan and other hunters who had been on the trip.

Duncan died aged 77 of a cerebral hemorrhage at his ranch in Smithville, Texas on March 28, 2010.