Cecilius Calvert, 2nd Baron Baltimore (August 8, 1605 – November 30, 1675), was a member of the English nobility who started the colony of Maryland in the British colonies. He was the first Proprietary Governor of the Province of Maryland. Before that, he was the ninth Proprietary Governor of the Colony of Newfoundland (in what is today Canada). His father was George Calvert, 1st Baron Baltimore. George Calvert was chosen to be the proprietary governor of both Maryland and Newfoundland, but he died before he could take the position.