One woman was gravely wounded.
Opacic said those three women were killed because they were doing their job and fighting against abusers and bullies. She said headway had been made in the last 20 years, because now one could openly say that most women victims were abused at home, but also in the workplace.
Opacic said it was important to teach nonviolent conflict resolution in schools.
Supreme Court President Branko Hrvatin said a society's civilisation level was measured by its treatment of its most unprotected and weakest members, most frequently women and children.
He said data on violence at and outside of the home showed that there was a lot of work ahead.
Hrvatin said courts must be places of security and justice, which was not so at the Zagreb Municipal Court in 1999. The whole society must work on security and not much will be done without faith in the judiciary, even though we work a lot, justly and without bias, he added.
Also today, the ruling Social Democratic Party's Women's Forum said that 12 women died as a result of domestic violence in 2011 and attempts were made on the lives of eight.
Seven women have been killed this year.
Despite the national strategies on protection from domestic violence, the negative trends continued in the first half of this year, with women accounting for 76 per cent of the victims in 21 attempted murders between family members, said Assistant Social Policy Minister Iva Prpic said.
She added that since 2009, the government had given HRK 23 million (about 3.1 million euros) to women's shelters.