The 31-year-old was deemed surplus to requirements at Leonardo Garilli and has decided to take up an offer by the nerrazzuri.
Composed midfielder Gautieri was not short of offers, with Torino tabling a three-year deal, but Atalanta were the most persuasive.
This is a new chapter for Gautieri, as Atalanta will be his ninth club.
During a career that has spanned 15 years, he has played for teams of the stature of Roma, Perugia, Bari and Empoli.
