Oksana Ivanovna Yermakova (Russian: ?????? ???????? ????????, Estonian: Oksana Jermakova) (born 16 April 1973) is an Estonian and Russian épée fencer.
She represented Soviet Union in 1991, Estonia in 1992–1997 and Russia in 1998–2005.She won two gold medals in the team épée event at the 2000 and 2004 Summer Olympics.
She competed for Estonia at the 1996 Summer Olympics.