Christian Schlagle Eyster (May 19, 1814 – November 6, 1886) was an associate justice of the Colorado Territorial Supreme Court from August 11, 1866, to March 2, 1871.

[1] Eyster was President Johnson's last Colorado judicial appointment.

He practiced law in Pittsburgh from 1837 to 1840 and was a member of the Pennsylvania Legislature from 1853 to 1855.

[3] From 1875 to 1877, Eyster served as district attorney for a large part of northeastern Colorado, including Denver (then in Arapahoe County) and Weld County.

[5] He then practiced law and was involved in mining operations from 1878 until his death.