Luguelín Miguel Santos Aquino (born 12 November 1992)[1] is a Dominican sprinter, who specialises in the 400 m. He was the silver medallist in the event at the 2012 London Olympics at the age of nineteen.

[3] He broke his first national junior record at the competition as part of the Dominican 4×400 metres relay team, running a time of 3:13.18 minutes.

[8] Stepping up to the global stage, he came sixth in the final at the 2010 World Junior Championships in Athletics then achieved his first major victories at the Youth Olympic Games in Singapore, taking the 400 m and sprint medley relay titles.

[10] A hamstring injury hampered his training in the first half of the year and also led to him pulling up in the final at the 2011 Central American and Caribbean Championships.

He excelled at the 2011 Pan American Games, where a series of good runs culminated in two silver medals and two Dominican records.

[12] A day later he ran at the 2012 Ibero-American Championships in Athletics in Barquisimeto with the Dominican relay team, taking a bronze medal and securing their place at the Olympics.

After winning his country's first ever medal at the World Junior Championships in Barcelona (of which he was later stripped due to age falsification), Santos said: "so far only Americans have finished in under 44 seconds, I want to be the first from somewhere else".

In the 400 m final of the 2013 World Championships, Santos went from a non-medal position to winning the bronze medal, after closing down several athletes on the home straight, including the defending champion, Kirani James.

[15] At the 2016 Olympics, Santos finished second in his 400 m preliminary heat, behind Wayde Van Niekerk (who was to go onto break the World Record in the final).