Wrench is a surname, and may refer to:
Benjamin Wrench (1778–1843), English actor Christopher Wrench (born 1958), Australian organist and lecturer Connor Wrench (born 2001), British rugby player David Wrench (disambiguation), multiple people Edward Thomas Jones Wrench (1828–1893), Australian businessman Edwin Wrench (1876–1948), English-born Australian politician Evelyn Wrench (1882–1966), British journalist George Wrench (1876–1948), English-born Australian politician Guy T. Wrench (1877–1954), British agronomist and physician John Wrench (1911–2009), American mathematician John Mervyn Dallas Wrench (1883–1961), British engineer Margaret Stanley-Wrench (1916–1974), English poet and author Mark Wrench (born 1969), English footballer Nigel Wrench, English radio presenter Sarah Wrench (1833–1848), reputed witch buried at East Mersea