Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We hereby consent to the incorporation by reference in this Registration Statement onForm S-8 of our report dated February 2, 2017 relating to the financial statements, and the effectiveness of internal control over financial reporting, which appears in Biogen Inc.’s Annual Report on Form10-K for the year ended December 31, 2016.
/s/ PricewaterhouseCoopers LLP
Boston, Massachusetts
June 16, 2017