Exhibit 31.1
CERTIFICATION OF CHIEF EXECUTIVE OFFICER
I, Richard D. Calder, Jr., certify that:
1. I have reviewed this Amendment No. 1 to the Annual Report on Form 10-K of GTT Communications, Inc. for the year ended December 31, 2019; and
2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;
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| Date: | May 8, 2020 | /s/ Richard D. Calder, Jr. |
| | | Richard D. Calder, Jr. |
| | | President and Chief Executive Officer |
