Zivar Hosseinzadeh

 (زيور حسین زاده) (born June 19, 1980) is a Iranian-born professional women's baseball pitcher and former softball pitcher, originally from,. She currently plays for the Toronto Sphinx of Major League Women's Baseball, and in February 2006 she became a naturalized citizen of.

Career
Zivar was part of the Iranian national softball team. She competed in the in  and  in  under.

Shortly after the preliminary round of softball at the 2004 Summer Olympics on September 20, Zivar defected. She told the team's minders that she was going to get dinner at a restaurant but ran out of the Olympic Village, running for more than thirty minutes before bumping into a Persian-speaking Iranian-American tourist who then called a taxi for her. She then took the taxi to the British embassy where she requested asylum.

Afterwards, she wound up in the, where she signed with Major League Women's Baseball's Boston Dream in 2005. On February 10, 2006, offered her citizenship, which she accepted.