Exhibit 23.1
Consent of Independent Registered Public Accounting Firm
We consent to the reference to our firm under the caption “Experts” and to the use of our report dated October 12, 2018, in the Registration Statement (Form S-1) and related Prospectus of Alector, Inc. for the registration of shares of its common stock.
/s/ Ernst & Young LLP
San Jose, California
January 2, 2019