Iziane "Izi" Castro Marques (born March 13, 1982) is a retired Brazilian professional basketball player.

Castro Marques played for the Brazil women's national basketball team and played for the Miami Sol, Phoenix Mercury, Seattle Storm, Atlanta Dream, Washington Mystics and the Connecticut Sun of the Women's National Basketball Association (WNBA).

Castro Marques also played overseas in France, Brazil, Spain, Latvia, Turkey, Poland and Russia.

Following her retirement, Castro Marques became the technical director of Sampaio Basquete of the Brazilian Women's Basketball League.

In her rookie season, Castro Marques was the second-youngest player in the WNBA at the time (20 years, 1 month, 12 days).

Castro Marques chose not to play in the WNBA in 2004 to focus on the Brazilian national team for the Summer Olympics that year.

During the 2008-09 WNBA off-season, Castro Marques played for Villeneuve d'Ascq in France, Extragusa Vilagarcia in the Spanish League and Spartak Moscow in Russia.

[13] Her national team has finished fourth in two consecutive international competitions, the 2004 Summer Olympics and the 2006 FIBA World Championship for Women, which Brazil hosted.