QuickLinks -- Click here to rapidly navigate through this document
Exhibit 23.1
Consent of Independent Registered Public Accounting Firm
�� We consent to the incorporation by reference in this Registration Statement on Form F-3 of our reports dated March 6, 2020 relating to the financial statements of GasLog Ltd. (the "Company") and the effectiveness of the Company's internal control over financial reporting, appearing in the Annual Report on Form 20-F of the Company for the year ended December 31, 2019. We also consent to the reference to us under the heading "Experts" in such Registration Statement.
/s/ Deloitte LLP
London, United Kingdom
July 10, 2020
QuickLinks
Consent of Independent Registered Public Accounting Firm