Robert James Hamilton Lambert (18 July 1874–24 March 1956) was an Irish cricketer.
A right-handed batsman and a right-arm off spin bowler, he played 51 times for the Ireland cricket team between 1893 and 1930, including 23 first-class matches, captaining them on 13 occasions.
He also played first-class cricket for London County and Woodbrook Club and Ground.
On his death, the Wisden Cricketer's Almanack described him as the best all-rounder produced by Ireland.