Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We hereby consent to the incorporation by reference in the Registration Statements (Form S-8 Nos. 333-139996, 333-112010, 333-105781, 333-105516, 333-38932, 333-77823, 333-47003, 333-38940, 333-30647, 333-174922, 333-188974, 333-209061, 333-64568, 033-55327 and 333-22465 and Form S-3 No. 333-213149) of MasTec, Inc. of our reports dated February 28, 2019 relating to the consolidated financial statements and financial statement schedule, and the effectiveness of MasTec, Inc.’s internal control over financial reporting which appear in this Form 10-K.

/s/BDO USA, LLP    

Miami, Florida

February 28, 2019