Based on the latest references and the Census of the population in Croatia from 1880 to 2011, the paper presents current and future trends in the number, share and aging of Serbian population in Croatia. Until the 2001 Census, the share of Serbs was slowly decreasing, in spite of evident persecutions, organized migrations and killings during the First and, especially, the Second World War. The breaking point occurred in the last decade of the 20th century when the share of Serbs dropped to one fifth when compared to the maximum, or to one third, when compared to the beginning of the decade. The 2011 Census shows that a small remaining share of Serbs is dominated by ageing population, so the projections indicate that the share of Serbs will have dropped to only 2.4% until 2051.