Dan Tyler Moore (February 9, 1877 – April 15, 1941) was a career U.S. Army officer and an aide to President Theodore Roosevelt.

He was named after his maternal grandfather, Brigadier General Daniel Tyler, and he was also the great-great-nephew of Vice President Aaron Burr.

In 1898, he graduated from the Eidgenössische Polytechnische Schule in Zurich, two classes ahead of Albert Einstein.

Roosevelt wrote to Kaiser Wilhelm II, calling Moore "my young cousin" and secured his admission to the German artillery school, the first foreigner to attend.

[2] He returned to the United States in April 1910, prolonging his stay in Europe for six weeks so he would qualify as a non-resident for customs fees.

Upon his return to the United States in 1919, he resigned from active duty, though he maintained a reserve commission until his death on April 15, 1941.