Mattel (MAT) S-8 Registration of securities for employees

EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in this Registration Statement on FormS-8 of Mattel, Inc. of our report dated February 27, 2018 relating to the financial statements, financial statement schedules and the effectiveness of internal control over financial reporting, which appears in Mattel, Inc.’s Annual Report on Form10-K for the year ended December 31, 2017.

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP

Los Angeles, California

May 31, 2018