Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the reference to our firm under the caption “Experts” in this Registration Statement on Form F-4 of BP p.l.c. and BP Capital Markets America Inc. and related prospectus of BP Capital Markets America Inc. for the registration of guaranteed notes of BP Capital Markets America Inc. and to the incorporation by reference therein of our reports dated March 29, 2018, with respect to the group financial statements of BP p.l.c., and the effectiveness of internal control over financial reporting of BP p.l.c., included in its Annual Report on Form 20-F for the year ended December 31, 2017, filed with the Securities and Exchange Commission.

/s/ Ernst & Young LLP

Ernst & Young LLP

London, England

November 14, 2018