Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos. 333-226362, 333-217452, 333-209808, 333-209806, 333-202424, 333-194276, 333-190631, 333-189720, 333-186875, 333-183028, 333-179772, 333-172632, 333-172093, 333-165350, 333-157931, 333-152174, 333-140581) of Mellanox Technologies, Ltd. of our report dated February 20, 2020 relating to the consolidated financial statements, financial statement schedule and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ Kost, Forer, Gabbay and Kasierer

Kost, Forer, Gabbay and Kasierer

A member of EY Global

Tel-Aviv, Israel

February 20, 2020