Exhibit 31.3

Certification of Principal Executive Officer

pursuant to

Exchange Act Rules 13a-14(a) and 15d-14(a),

as adopted pursuant to

Section 302 of the Sarbanes-Oxley Act of 2002

I, Vladimir Shmunis, certify that:

1. I have reviewed this Amendment No. 1 to the Quarterly Report on Form 10-Q of RingCentral, Inc.; and

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report.

/s/ Vladimir Shmunis

Vladimir Shmunis

Chief Executive Officer and Chairman

(Principal Executive Officer)

Date: November 14, 2022