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 March 24, 2021, in the Registration Statement (Form F-1) and related Prospectus of Oatly Group AB dated April 19, 2021.

/s/ Ernst & Young AB

Stockholm, Sweden

April 19, 2021