Alek Wek (born 16 April 1977) is a Sudanese British model who first appeared on the catwalks at the age of 18 in 1995, sparking a career lasting to date. She is from the Dinka ethnic group in Southern Sudan, but in 1991 she and some family members fled to Britain to escape the civil war in Sudan. She later moved to the United States.

Wek was discovered at an outdoor market in London in 1995 in Crystal Palace, south London, by a Models 1 scout. She first received attention when she appeared in the music video for "GoldenEye" by Tina Turner, in 1995 and from there entered the world of fashion as one of its top models. She was signed to Ford Models in 1996 and was also seen in the "Got 'Til It's Gone" music video by Janet Jackson that year. She was named "Model of the Year" in 1997 by MTV. She was the first African model to appear on the cover of Elle, also in 1997.

She is a member of the U.S. Committee for Refugees' Advisory Council and is helping to raise awareness about the situation in Sudan, as well as the plight of refugees worldwide. She can base this on her own experience as a refugee, fleeing the war in her country of birth.

She is a missionary for World Vision, an organisation which combats AIDS, an ambassador for Doctors Without Borders in Sudan, and devotes time toUNICEF.

In 2007, she released an autobiography, entitled Alek: From Sudanese Refugee to International Supermodel, documenting her journey from a childhood of poverty in Sudan to the catwalks of Europe.

In 2011, she appeared as a guest judge in the sixteenth cycle of America's Next Top Model.