Borda Rock (, ) is the rock off the NW coast of Smith Island in the South Shetland Islands, Antarctica 270 m long in southwest-northeast direction and 90 m wide (extending 543 by 175 m together with the adjacent minor rocks). Its surface area is 1.46 ha. The vicinity was visited by early 19th century sealers.
The feature is named after Jean-Charles de Borda (1733-1799), a French mathematician, physicist and Navy officer who refined the reflecting circle; in association with other names in the area deriving from the early development or use of geodetic instruments and methods.
Borda Rock is located at , which is 240 m northwest of Gregory Point. Bulgarian mapping in 2009 and 2017.