The Cemfjord was a Cyprus-registered cargo ship which foundered in the Pentland Firth off the north-east coast of Scotland on 2 January 2015.

Built as the general cargo ship Margareta in 1984, she was converted to carry cement in 1998 and was en route from Aalborg, Denmark to Runcorn, Cheshire, United Kingdom when she capsized in bad weather and sank in 82 metres (270 ft) of water.

In May 1995 she was sold to the Margareta – Shark Shipping Co NV, Willemstad, Netherlands Antilles and placed under the management of Briese Schiffahrts GMBH & Co KG, Bremen, Germany.

[5] On her last voyage, Cemfjord was carrying 2,000 tonnes of cement from Aalborg in Denmark to Runcorn in Cheshire and was due to arrive on 5 January 2015.

At 14:30 on 3 January,[7] her upturned hull was sighted eleven nautical miles (20 km) east of the Pentland Skerries by the NorthLink ferry Hrossey, which was sailing from Shetland to Aberdeen.

[11] An MAIB underwater survey located the vessel on the seabed at a depth of around 82 metres (270 ft),[12] twelve miles (19 km) east of Muckle Skerry.

[10] The MAIB investigation concluded that the ship "capsized in extraordinarily violent sea conditions caused by gale-force winds and a strong, opposing tidal stream.

The master's decision to take Cemfjord into the Pentland Firth at that time was probably influenced by actual or perceived commercial pressures and his personal determination to succeed.

"[14] According to the MAIB, the Cemfjord also suffered from "significant safety deficiencies relating to its rescue boat launching arrangements and bilge pumping system in the void spaces beneath the cement cargo holds.

The ship's owner, Brise of Hamburg, has said that no attempt to raise the wreck would be made and it will be left as a sea grave.

[15] Less than two months prior to her sinking, on 7 October 2014, Cemfjord was left with a list in the Pentland Firth, after her cargo shifted.

Contrary to regulations, the incident was not reported to the MAIB, although an internal investigation was carried out by Brise, the ship's managers.