Katarina Blagojević (née Jovanović; 31 October 1943 — 15 November 2021), also known as Katarina Blagojević-Jovanović[3] (Serbian Cyrillic: Катарина Благојевић-Јовановић) was a Serbian chess player who held the title of Woman Grandmaster (WGM, 1986).

An established star since the early 1960s, Katarina was joined in that status by her two younger sisters — first by the middle, future WIM Ružica, in the late 1960s,[4] while the youngest, future WIM and top-20 player, Gordana, soon followed in the early 1970s — and they became known in the chess world as the Jovanović sisters.

[5][6][7][8] Each sister won a Yugoslav women's national championship[9] and played in Interzonal Tournaments.

When all three qualified for a zone tournament in the early 1970s, it was the first such occurrence in the history of international chess, and it caused FIDE to draft a new paragraph about family relationships to avoid potential situations of matches being thrown by one to help another.

[1][12] Katarina Blagojević played in two Women's World Chess Championship Interzonal Tournaments: She also won the European Zonal 1 in 1975 in Karlovy Vary,[1] but didn't play in the subsequent Interzonal Tournament.