Aaron Nigel Armstrong is a track and field sprint athlete who competes internationally for Trinidad and Tobago. He is the 2008 Olympic champion in 4 × 100 metres relay.
The men's 4 × 400 metres relay event at the 2008 Summer Olympics took place on 22 and 23 August at the Beijing National Stadium.
The men's 4 x 400 metres relay at the 2009 World Championships in Athletics was held at the Olympic Stadium on August 22 and August 23.
The Men's 4 × 400 metres relay event at the 2011 World Championships in Athletics was held at the Daegu Stadium on 1 and 2 September. Thursday and Friday. This is a change in schedule from previous years when all the relays were at the end of the program. This might necessitate a change in strategy to allow for team members involved in other events.
The men's 4 x 400 metres relay at the 2013 World Championships in Athletics was held at the Luzhniki Stadium on 15–16 August.
The men's 400 metres event at the 2016 Summer Olympics took place between 12 and 14 August at the Olympic Stadium. Fifty-three athletes from 35 nations competed. The event was won by Wayde van Niekerk of South Africa, the nation's second gold medal in the men's 400 metres. Kirani James of Grenada and LaShawn Merritt of the United States became the sixth and seventh men to win two medals in the event, but Michael Johnson remained the only man with two gold medals.
The men's 4 × 400 metres relay competition at the 2016 Summer Olympics in Rio de Janeiro, Brazil was held at the Estádio Olímpico João Havelange on 19–20 August.
The women's 4 × 100 metres relay competition at the 2016 Summer Olympics in Rio de Janeiro, Brazil was held at the Estádio Olímpico João Havelange on 18–19 August.
The women's 4 × 400 metres relay competition at the 2016 Summer Olympics in Rio de Janeiro, Brazil was held at the Estádio Olímpico João Havelange on 19–20 August.
The men's 4 x 400 metres sprint competition of the athletics events at the 2015 Pan American Games will take place between the 24 and 25 of July at the CIBC Pan Am and Parapan Am Athletics Stadium. The defending Pan American Games champions are Noel Ruíz, Raidel Acea, Omar Cisneros, William Collazo, Júnior Díaz, Amaurys Valle and Amaurys Valle of Cuba.
The women's 4 × 100 metres relay at the 2015 World Championships in Athletics was held at the Beijing National Stadium on 29 August.
The men's 4 × 400 metres relay at the 2016 IAAF World Indoor Championships took place on March 19 and 20, 2016.
The men's 4 × 400 metres relay at the 2017 IAAF World Relays was held at the Thomas Robinson Stadium on 22–23 April.
The men's 4 × 400 metres relay at the 2017 World Championships in Athletics was held at the London Olympic Stadium on 12 August.
The women's 4 x 100 metres relay at the 2017 World Championships in Athletics was held at the London Olympic Stadium on 12 August.
The women's 4 x 400 metres relay at the 2017 World Championships in Athletics was held at the London Olympic Stadium on 12–13 August.
The men's 4 × 400 metres relay at the 2018 IAAF World Indoor Championships took place on 3 and 4 March 2018.
The men's 4 × 400 metres relay competition of the athletics events at the 2019 Pan American Games took place on the 10 of August at the 2019 Pan American Games Athletics Stadium. The defending Pan American Games champion is Trinidad and Tobago.
The women's 4 × 400 metres relay at the 2019 World Athletics Championships was held at the Khalifa International Stadium in Doha, Qatar, from 5 to 6 October 2019. In the final the Jamaican team were initially disqualified, but were reinstated as the bronze medallists upon appeal.
The men's 4 × 400 metres relay at the 2019 World Athletics Championships was held at the Khalifa International Stadium in Doha, Qatar, from 5 to 6 October 2019.
