Exhibit 24.1

POWER OF ATTORNEY

Each person whose signature appears below hereby constitutes and appoints Gary J. Wojtaszek and Gregory R. Andrews and each of them singly, his true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all capacities, to sign any and all documents relating to the Annual Report on Form 10-K of CyrusOne Inc., including any and all amendments and supplements thereto, for the year ended December 31, 2015 and to file the same, with all exhibits thereto and all other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents or either of them, or their or his or her substitutes or substitute, may lawfully do or cause to be done by virtue hereof.

Signature	Date
/s/ Alex Shumate
Alex Shumate, Chairman of the Board	February 25, 2016
/s/ William E. Sullivan
William E. Sullivan, Director	February 25, 2016
/s/ John Gamble
John Gamble, Director	February 25, 2016
/s/ T. Tod Nielsen
T. Tod Nielsen, Director	February 25, 2016
/s/ Melissa E. Hathaway
Melissa E. Hathaway, Director	February 25, 2016
/s/ David H. Ferdman
David H. Ferdman, Director	February 25, 2016
/s/ Lynn Wentworth
Lynn Wentworth, Director	February 25, 2016