Prince Karl or Karel or Carl may refer to:

Prince Karl Joseph (died 1653)

She first met Prince Karl of Hohenzollern-Sigmaringen in Berlin in 1861.

Prince Karl seemed a fantasy then.

Prince Karl of Hesse and by Rhine (1809-1877)

Prince Karl joined the Bavarian Army and rose to be Field Marshal in 1841.

Prince Karl did not know his allies' location and simply waited, until it was too late.

Prince Karl married twice, both times morganatically:

Prince Karl (1785-1853), the son of Anton Aloys, ruled from 1831 until 1848.

Prince Karl of Hesse and by Rhine (23 April 1809 - 20 March 1877)