Nataliia Prologaieva (, born 17 February 1981), also known as Nataliia Ziani (ÃÂðÃÂðûÃÂàÃÂÃÂÃÂýÃÂ), is a Ukrainian Paralympic swimmer who won gold at the 2012 Summer Paralympics in the women's 100 metre breaststroke SB4 and women's 200 metre individual medley SM5 events.