"Both the security forces and the Forces Nouvelles are committing these horrific acts and their vicitms have no recorse to justice. This reign of terror must end," said Amnesty researcher Gaetan Mootoo in a statement.
The crisis began after Laurent Gbagbo, in power since 2002, refused to step down after his rival, Alassane Ouattara, was recognised internationally to have won the presidential vote.
Amnesty interviewed women who were gang-raped in front of their families and on the way to the market, while witnesses say people were beaten and killed in the street.
"The eyes of the world may have shifted from the political stalemate in Côte d'Ivoire, but the abuses are clearly continuing," said Mootoo.
The United Nations estimates that at least 300 people have died in post-electoral violence since mid-December.