Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in this Registration Statement on Form S-8 of Information Services Group, Inc. of our report dated March 13, 2025 relating to the financial statements, financial statement schedule and the effectiveness of internal control over financial reporting, which appears in Information Services Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2024.

/s/ PricewaterhouseCoopers LLP

New York, New York

May 9, 2025