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-3 (No. 333-216199) and FormS‑8 (Nos.333-195807, 333-202738, 333-209663, 333-216198, 333-223239, and 333-226714) of Alder BioPharmaceuticals, Inc., of our report dated February 25, 2019 relating to the financial statementsand the effectiveness of internal control over financial reporting, which appears in this Form 10‑K.

/s/ PricewaterhouseCoopers LLP
Seattle, WashingtonFebruary 25, 2019