Brenton Loch (Spanish Bahia de Ruiz Puente) is an inlet-cum-small fjord in the Falkland Islands. It is one of a handful of so-called sea lochs outside Scotland. It is sometimes known as "Brenton Sound". "Loch" is normally pronounced as "lock" in the English rather than Scottish manner, i.e. without a fricative "ch". The far south of the loch is known as "La Boca" or "The Boca".
The loch cuts into East Falkland and, together with Choiseul Sound to the east, divides Lafonia from the northern half of the island. It lies to the west of the isthmus on which Darwin and Goose Green are located. At its seaward end, it becomes Grantham Sound. Its name may originate from the fact that many of the inhabitants of Goose Green in the 19th century were Scots.
In the 1920s, the sailor Conor O'Brien visited the loch onboard his ship Saoirse, in which he circumnavigated.