Edward Wanshear Wynkoop (June 19, 1836 – September 11, 1891) was a US Army officer during the American Civil War and later an Indian agent.

[1] Edward Wanshaer "Ned" Wynkoop was born on June 19, 1836, in Philadelphia, Pennsylvania, the youngest of eight children.

[4] Wynkoop was appointed the first sheriff of Arapahoe County, Kansas Territory (entire NE quarter of present State of Colorado) on September 21, 1858.

During a period as post commander at Fort Lyon, Colorado in 1864, Wynkoop encouraged peace efforts with the Cheyenne, but was transferred in November 1864 to Fort Riley, Kansas, where he was posted at the time of the Sand Creek massacre.

In 1866, Wynkoop became an Indian agent for the Southern Cheyennes and Arapaho, resigning in December 1868 in protest of the destruction of Black Kettle's village in the Battle of Washita River.