Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement Nos. 333-209915, 333-194458, 333-187061, 333-179797, 333-166645, 333-144065, 333-161172, 333-130389, 333-179796, 333-202642, 333-223688, 333-231824, 333-239475 and 333-266537 on Form S-8 of our reports dated March 6, 2023, relating to the financial statements of PC Connection, Inc., and the effectiveness of PC Connection Inc.’s internal control over financial reporting appearing in the Annual Report on Form 10-K for the year ended December 31, 2022.

/s/ Deloitte & Touche LLP

Boston, Massachusetts

March 6, 2023