Exhibit 15.3

Auditor letter of Ernst & Young, independent registered public accounting firm, pertaining to Item 16F

April 29, 2011

Office of the Chief Accountant
Securities and Exchange Commission
100 F Street, N.E.
Washington, DC 20549-7561

Ladies and Gentlemen:

We have read Item 16F — Change in Registrant’s Certifying Accountant of Form 20-F dated April 29, 2011 of WNS (Holdings) Limited and are in agreement with the statements contained in paragraphs 2, 3, 4 and 5 on page 140 therein. We have no basis to agree or disagree with other statements of the registrant contained therein.

Very Truly yours,

/s/ Ernst and Young