Robert Child (February 1739 – 28 July 1782) was an English banker and politician. He was the Member of Parliament (MP) for Wells from 1765 until his death.
He was the second surviving son of Samuel Child MP, and younger brother of Francis Child. In 1763, he succeeded his brother as nominal head of the family's bank, Child & Co., bringing him an annual income of over £30,000 (£3.33 million in 2017). He also inherited the estate of Osterley Park in Middlesex, where he continued his brother's project of remodelling the house to the designs of Robert Adam.
Child contested Aylesbury at a by-election in 1764, but withdrew due to ill-health. The following year he contested Wells, and after a bitterly fought campaign, two polls were held; one returned Child, the other his rival Peter Taylor, a local grocer's son who grown rich as an army commissary in Germany during the Seven Years' War. In early 1766 Child was awarded the seat on petition. He appears never to have spoken in the House of Commons, and voted largely with the opposition despite his bank's significant business with the government.
In October 1763, Child married Sarah Jodrell, daughter of Gilbert Jodrell of Ankerwyke, Buckinghamshire. They had only one child, a daughter Sarah Anne (born 1764), who in May 1782 eloped to Gretna Green to marry the 10th Earl of Westmorland. Her father abhorred the Earl, and pursued the couple until one of his horses was shot by Westmorland's men. Her father had approved the marriage before his death in July that year, but disinherited her to prevent his fortune falling into Westmorland's hands.