Jamoliddin Tulaganov, 23, and Nuriddin Shakhabutdinov, 22, both of Byron Road, Chelmsford, are due before Chelmsford magistrates on Monday.
The men have been charged in connection with an attack on a woman in Central Park in the town on 15 January.
A 23-year-old man arrested on 17 January has been released from his bail with no further action expected.
Mr Shakhabutdinov and Mr Tulaganov have also been charged with an unrelated incident on 13 November, in which a 39-year-old woman was assaulted in Baddow Road, Chelmsford.
In all, Mr Tulaganov is charged with two counts of rape and another of sexual assault, while Mr Shakhabutdinov faces one charge of rape, one of assault and another of sexual assault.
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