Phillips 66 (PSX) 10-K 2017 FY Annual report

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the following Registration Statements:

(1) Registration Statement (Form S-8 No. 333-181080), as amended, pertaining to the Phillips 66 Savings Plan,

(2) Registration Statement (Form S-8 No. 333-188564) pertaining to the 2013 Omnibus Stock and Performance Incentive Plan of Phillips 66, the Phillips 66 U.K. Share Incentive Plan, and the Phillips 66 Ireland Share Participation Plan,

(3) Registration Statement (Form S-3 No. 333-181079) of Phillips 66, and

(4) Registration Statement (Form S-3 No. 333-207923) of Phillips 66 and Phillips 66 Company;

of our reports dated February 23, 2018, with respect to the consolidated financial statements of Phillips 66 and the effectiveness of internal control over financial reporting of Phillips 66 included in this Annual Report (Form 10-K) of Phillips 66 for the year ended December 31, 2017.

/s/ Ernst & Young LLP

Houston, Texas

February 23, 2018