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 (No. 333-197654, No. 333-188953, No. 333-182868, No. 333-171216, No. 333-162649, No. 333-153025, No. 333-141007, No. 333-125904, No. 333-56776, No. 333-54384, No. 333-37216, No. 333-31304, No. 333-06859) and Form S-3 (No. 333-180984) of Altera Corporation of our report dated February 13, 2015, relating to the consolidated financial statements and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP

San Jose, California

February 13, 2015