The three women, who are members of the feminist group Femen, were sentenced to four months in prison for appearing in front of the Palace of Justice in May where they removed their blouses, Tunisia Live reported Wednesday.
They were protesting the trial of fellow Femen activist, Amina Sboui, who was at the time charged with possession of pepper spray.
Their chests were painted with slogans such as "Breasts Freed" and "Femen Sexetremist." The three protesters chanted "Free Amina" and held banners with the Femen symbol.
Sboui was the first Tunisian to post topless photographs of herself online as part of the Femen campaign.
The three Femen activists sentenced Wednesday were Pauline Hiller and Marguerite Stern of France, and Josephine Markmann of Germany, Tunisia Live said.