Borthwick is a surname. Notable people with the surname include:
Alastair BorthwickAlgernon Borthwick, 1st Baron GleneskBill Borthwick - see William Borthwick belowDavid Borthwick, Australian public servantJack Borthwick (1884–1948), Australian footballerJamie BorthwickJohn Borthwick (footballer) (born 1964), English footballerJohn Borthwick (veterinary surgeon) (1867–1936), veterinary surgeon in the Cape Colony, South AfricaSir John Thomas Borthwick, 3rd Baronet (1917–2002) of the Borthwick baronetsJohn Borthwick, 5th Lord Borthwick (died 1566)John Borthwick, 8th Lord Borthwick (died 1623)John Borthwick, 9th Lord Borthwick (1616–1675) (dormant 1675)John David BorthwickJohn David Borthwick (1824–1892), Scottish journalist and authorJohn Henry Stuart Borthwick, 23rd Lord Borthwick (1905–1996) (confirmed in title 1986)John Hugh Borthwick, 24th Lord Borthwick (born 1940)Mamah BorthwickMark BorthwickPeter BorthwickScott BorthwickStephen Borthwick (Headmaster of Epsom College)Steve Borthwick, English international rugby union playerWalter Borthwick (born 1948), Scottish football player and manager