|Competitor for Cuba|
|World Amateur Championships|
|Pan American Games|
|2003 Santo Domingo||Lightweight|
|Central American and Caribbean Games|
Mario César Kindelán Mesa (born August 10, 1971 in Holguín) is a former two time Olympic Gold Medalist amateur boxer from Cuba, who competed in the lightweight category. He is the cousin of baseball player Orestes Kindelán.
His most successful period came in a winning streak starting with the 1999 Pan American Games title, and covered every major event he entered including the 2000 Summer Olympics in Sydney, three world championships (1999, 2001, 2003), and the 2003 Pan American Games. His most recent victory was at the 2004 Summer Olympics in Athens, defeating Amir Khan in the final, and retaining his gold medal from four years earlier.
Kindelan holds wins over future professional world champions Felix Trinidad, Miguel Cotto, Amir Khan and Andreas Kotelnik. Kindelan also beat fellow Olympic champions Somluck Kamsing and Felix Diaz
Prior to the Olympics in 2004 Kindelan had beaten Khan 33-13 at the pre-tournament as well as beating him at the Olympics 33-22
Mario Kindelan's amateur record was 358-22, having not lost since 1999 till his retirement in 2004.
- 1998 World Cup Champion
- 1999 Pan-American Games Champion
- 1999 World Champion
- 2000 Olympic Gold Medalist
- 2001 World Champion
- 2003 World Champion
- 2003 Pan-American Games Champion
- 2004 Olympic Gold Medalist
In 1999, he was named as one of the top ten athletes in Cuba, and was named Boxer of the Year.
2000 Olympic Games
- 1st round bye
- Defeated Pongsith Wiangwiset (Thailand) 14-8
- Defeated Tigran Ouzlian (Greece) RSC 4
- Defeated Alexandr Maletin (Russia) 27-15
- Defeated Andreas Kotelnik (Ukraine) 14-4 in the Gold Medal match.
2004 Athens Olympic Games
Kindelan's results in the games, were as follows:
- Round of 32: Defeated Ahmed Sadiq of Nigeria (RSC-3)
- Round of 16: Defeated Asghar Ali Shah of Pakistan (24-9)
- Quarterfinals: Defeated Rovshan Huseynov of Azerbaijan (23-11)
- Semifinals: Defeated Murat Khrachev of Russia (20-10)
- Gold Medal match: Defeated Amir Khan of Great Britain (30-22)
World Amateur Championships
1999 in Houston, United States (as a lightweight)
- Defeated Mahlon Kerwick (United States) 10-4
- Defeated Temur Suleymanov (Uzbekistan) 3-2
- Defeated Pongsith Wiangwiset (Thailand) 8-2
- Defeated Gheorghe Lungu (Romania) 9-4
- Defeated Aleksei Stepanov (Russia) 10-3
2001 in Belfast, Northern Ireland (as a lightweight)
- Defeated Donier Khatamov (Tajikistan) RSC-OS 2
- Defeated Martin Kristjansen (Denmark) RSC-OS 3
- Defeated Patrick Bogere (Sweden) RSC-OS 2
- Defeated Alexandr Maletin (Russia) RSC-OS 3
- Defeated Vladimir Kolesnik (Ukraine) 29-15
2003 in Bangkok, Thailand (as a lightweight)
- Defeated Boris Georgiev (Bulgaria) RSCH 4
- Defeated Stephen Burke (England) RSC-OS 3
- Defeated Jong Sub-Baik (South Korea) 30-14
- Defeated Gyula Kate (Hungary) 24-12
- Defeated Pichai Sayotha (Thailand) 45-27 
In May 2005, aged 34, he came out of retirement and travelled to Bolton, England for a third fight with Amir Khan. He had beaten Khan twice already the previous year – in the Pre-Olympic tournament and the Olympic Lightweight final – however Khan had become a popular attraction in the UK and a third fight was arranged to set up his professional debut. Khan beat Kindelan on points 19-13.
Having retired, he is generally considered as one of the greatest amateur boxers ever seen, leading to the comment during his final fight by the boxing commentator that he was "a professional in a vest".
Typical for athletes from Cuba, where professional sport is prohibited, his reward is his pride in representing his people on the Olympic stage. He said, of being offered $1 million to compete professionally, "I thanked them, but money cannot buy what I have."