Robert Richard Cornthwaite (born 24 October 1985), nicknamed "Cornflakes", is an Australian former soccer player.

Alongside Eli Babalj and Sasa Ognenovski, Cornthwaite, at 1.95 m is the joint third tallest player to have represented the Australia national association football team, behind Zeljko Kalac (2.02 m) and Harry Souttar (1.98 m).

[9][10] Robert joined the Malaysian Super League outfit Selangor in early 2015 and scored a few goals for the club.

[12] On 16 January 2018, Cornthwaite signed a contract with Malaysia Super League club Perak on a one plus one-year deal.

[14] Cornthwaite made his first senior international debut for the Socceroos on 4 March 2009 in an AFC Asian Cup qualifying match versus Kuwait.