{ { Infobox gymnast
|name = Boryana Kaleyn
|image =
|imagesize =
|caption =
|fullname = Boryana Nikolaeva Kaleyn
|altname =
|nickname = Buba, Bubi
|country =
|formercountry =
|birth_date =
|birth_place = Sofia, Bulgaria
|hometown = Sofia
|residence = Sofia
|height =
|weight =
|discipline = Rhythmic gymnastics
|level = Senior Elite
|natlteam = 2011 – present
|club= Levski Triaditsa
|gym=Rakovski
|collegeteam=
|headcoach = Branimira Markova
|assistcoach = Mariana Pamukova
|formercoach =
|choreographer =
|music =
|worldranking = 11 WC 19 WCC (2017 Season) |eponymousskills = |retired = |show-medals = yes |medaltemplates=
{ { MedalCount
| World Championships | 1|3|0
| European Championships | 5|3|5
| Junior European Championships | 0|0|1
| World Games | 1|1|0
| FIG World Cup | 18|14|11
| Grand Prix Series | 4|6|9
| Total|29|27|26}}
}}Boryana Nikolaeva Kaleyn' (; born 23 August 2000) is a Bulgarian individual rhythmic gymnast. She is the World champion in the team event at the 2023 World Championships in Valencia, as well as silver medalist in the clubs and ribbon finals. She is the 2023 European all-around champion as well as in the team competition, the 2022 European champion with ball, ribbon, and in the team competition, the 2021 and 2022 European all-around silver medalist, and the 2018 World team silver medalist. She competed at the 2020 Summer Olympics in the Rhythmic Gymnastics Individual All-Around and finished 5th place. At the national level, she is a four-time Bulgarian National Champion (in 2019, 2020, 2021, and 2022).
Career
Junior
Kaleyn started rhythmic gymnastics at age six and began appearing in international junior competitions in 2008. She has competed in the Junior World Cup and the Junior Grand Prix events. On June 10–16, 2014, Kaleyn competed at the 2014 European Junior Championships with Team Bulgaria (together with Erika Zafirova and Katerina Marinova) finishing 4th, Kaleyn qualified 1 apparatus final and won the bronze medal in ball. Kaleyn won the all-around bronze at the 2015 Sofia Junior World Cup.
Senior
Kaleyn debuted as a senior in the 2016 season, she finished 10th in the all-around at the Baltic Hoop International tournament. In her next event she finished 4th in the all-around at the Lisbon Senior International Tournament, she qualified for all the apparatus finals taking silver in hoop, ribbon, clubs and silver in ball. She then finished 10th in the all-around at the Corbeil-Essonnes Cup.
In the 2017 season, Kaleyn competed at the Moscow senior International Tournament where she made a breakthrough winning silver in the all-around. She won bronze in the all-around at the 2017 Bulgarian National Championships behind Neviana Vladinova and Katrin Taseva who took the gold and silver medals respectively. She then competed at the 2017 Tashkent World Cup finishing 4th in the all-around behind teammate Katrin Taseva and qualified to three event finals taking bronze in clubs and placed 7th in hoop and ball. Her next competition was at the 2017 Baku World Cup where she finished 9th in the all-around behind Nicol Zelikman. On May 3–7, Kaleyn won gold in the all-around at the MT Sofia Cup. On May 12–1, Kaleyn competed at the 2017 World Challenge Cup in Portimao where she finished 4th in the all-around behind Victoria Veinberg Filanovsky, she qualified to three event finals taking bronze in clubs, finished 5th in hoop and 6th in ball. Kaleyn competed at the quadrennial held 2017 World Games in Wrocław, Poland from July 20 to 30, however she did not advance to any of the apparatus finals.