On 16 January, at the European Championship Mitrović scored a goal in the first game in an 8–5 win against Spain. Mitrović was a big part of his team on 19 January, in a big 15–12 victory against the defending European champions Croatia. He scored two goals for his team. On 27 January Mitrović scored two goals in a semifinal 12–8 victory over Italy. Stefan Mitrović won the 2012 European Championship on 29 January. He scored two goals alongside his captain Vanja Udovičić in the final against Montenegro which his national team won by 9–8. Later that year he won a bronze medal at the 2012 Olympics.