Exhibit 23.3
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We hereby consent to the incorporation by reference in this Registration Statement on FormF-3 of our report dated 16 March 2018 relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in GlaxoSmithKline plc’s Annual Report on Form20-F for the year ended 31 December 2017. We also consent to the reference to us under the heading “Experts”in such Registration Statement.
/s/ PricewaterhouseCoopers LLP
London, United Kingdom
28 March 2018
