Demita Vega de Lille[a] (born 21 July 1983 in Mérida, Yucatán) is a Mexican windsurfer, who specialized in Neil Pryde RS:X class.

[1][2] She represented her nation Mexico at the 2008 Summer Olympics, and later picked up a silver medal in windsurfing at the 2011 Pan American Games in Guadalajara.

[3][4] Vega qualified for the Mexican squad in the newly introduced RS:X class at the 2008 Summer Olympics in Beijing by placing second and receiving a berth from the World Championships in Auckland, New Zealand.

[8][9] At the 2011 Pan American Games in Guadalajara, Vega sailed smoothly in all the races with a remarkable grade of 28 to settle only for the silver medal in the women's sailboard class, falling behind Brazil's Patrícia Freitas by a 16-point gap.

[10][11] She also sought to compete for the 2012 Summer Olympics in London, but failed to fulfill her requirements with the Mexican Sailing Federation with a prospect to grant a place for her in the same class.