William (or Williams) was launched at Blyth in 1811. In 1818, a letter of marque captured her, but she was then released. In October 1819, she fortuitously discovered the South Shetland Islands while on a voyage from Buenos Aires to Valparaiso. She was last listed in 1829.

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History
United Kingdom
Name	William
Launched	1811, Blyth, Northumberland
Fate	Last listed in 1829
General characteristics
Tons burthen	215,[1] or 216 (bm)
Armament	1813:6 × 6-pounder carronades 1814:6 × 6-pounder guns

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In 1811, William Smith became part owner of William; she first appeared in Lloyd's Register (LR) in 1811.^[1]

On 20 November 1817, Williams, Smith, master, of London, was at Bahia. She had been sailing from Buenos Ayres to London when she had encountered the Spanish letter of marque Rita, Atrate, master. The Spanish vessel had been sailing from St Andero and Loango and was on her way to Lima. Rita took Williams into Bahia.^{[2][lower-alpha 1]} After Williams had landed that part of her cargo "supposed to belong to Buenos Ayres", she was permitted to continue her voyage.^[4] On 6 May 1818 William arrived at Gravesend from Buenos Ayres and Bahia.

On 2 August 1818, Williams, Smith, master, sailed from Gravesend for Buenos Ayres. She arrived there on 22 October. In July 1819, Lloyd's List reported that she had arrived at Valparaiso from Buenos Ayres. In February 1819, William, Smith, master, fortuitously discovered the South Shetland Islands whilst sailing from Buenos Aires to Valparaiso.

Smith had been blown off course in Drake Passage and sighted Williams Point, the northeast extremity of Livingston Island, on 19 February 1819.^[5] That was the first land ever discovered south of 60° south latitude, in what is now the Antarctic Treaty area.^[6]

On reaching Valparaiso, Smith reported his discovery of the islands and the abundance of seals there, to Captain William Henry Shirreff, of HMS Andromache,^[7] which had arrived there about 5 September 1818. (Shirreff had been appointed the commanding officer of British naval forces in the Pacific.)

In October 1819, Smith revisited the South Shetlands, landing on King George Island on 16 October. On 24 November, Williams was back at Valparaiso from Monte Video.

Shirreff chartered William to carry a party consisting of Lieutenant Edward Bransfield, three midshipmen, and a ship's surgeon. They arrived in December and surveyed, mapped, and claimed the new lands for Britain. Furthermore, on 30 January 1820, Bransfield sighted Davis Coast on the Antarctic Peninsula.^[5] By mid-April William was back at Valparaiso.

On 27 April 1821 Williams, Smith, arrived at Rio de Janeiro from the New South Shetlands. From there, Williams sailed to Lisbon. She sailed from Portsmouth to London on 11 September.

William was last listed in 1829.