"Great Britain and Northern Ireland" competed at the 2017 IAAF World Championships in London, from 4–13 August 2017. It was the first time that the United Kingdom had hosted the World Championships. Mo Farah won the first medal for the host nation, also winning the first gold medal of the Championships.
Great Britain and Northern Ireland competed at the 2019 IAAF World Championships in Doha, from 27 September–6 October 2019. The nation won five medals at the championships – two gold medals, and three silvers. Dina Asher-Smith became the first British person to win three medals at a single championships, winning the women's 200 metres, taking silver in the Women's 100 metres, then getting another silver in the women's 4 × 100 metres relay. Asher-Smith broke the British records in both the 100 m and 200 m. She was Britain's first female sprint champion. Katarina Johnson-Thompson was the only other Briton to win an individual medal, taking the heptathlon gold medal with a British record score. The British men's 4 × 100 metres relay quarter ran a European record of 37.36 seconds to take a silver medal. The women's 4 × 400 metres relay team was briefly upgraded to the bronze medal, but the original medallists Jamaica were reinstated on appeal. Great Britain won the lowest number of medals since its performance at the 2005 World Championships in Athletics.
Belgium competed at the 2019 World Championships in Athletics in Doha, Qatar from 27 September to 6 October 2019. Belgium has entered 29 athletes. The country finished in 24th place in the medal table.
Canada is scheduled to compete at the 2022 World Championships in Athletics in Eugene, Oregon, United States, from July 15−24, 2022.
Cuba competed at the 2022 World Athletics Championships in Eugene, United States, from 15 to 24 July 2022. The Cuban Athletics Federation had initially entered 16 athletes, but ended up competing with 14 of them after the withdrawals of Yorgelis Rodríguez and Yiselena Ballar.
Peru competed at the 2022 World Athletics Championships in Eugene, United States, from 15 to 24 July 2022. The Peruvian Athletics Sport Federation had initially entered 8 athletes, but ended up competing with 6 of them due to the withdrawals of Jovana de la Cruz and Soledad Torre.
India competed at the 2022 World Athletics Championships in Eugene, Oregon, from 15 to 24 July 2022. India had entered 21 athletes. India won their first silver at the World Athletics Championships since their debut in the games. Neeraj Chopra became the first male Indian to win a medal at the World Athletics Championships.
Morocco competed at the 2022 World Championships in Athletics in Eugene, Oregon, United States. The country is currently in 22nd place in the medal table.
Colombia competed at the 2022 World Athletics Championships in Eugene, United States, from 15 to 24 July 2022. The Colombian Athletics Federation had initially entered 14 athletes, but ended up competing with 7 of them due to the withdrawals of 7 athletes.
Mexico competed at the 2022 World Athletics Championships in Eugene, United States, from 15 to 24 July 2022. The Federation of Mexican Athletics Associations entered 25 athletes.
Jamaica competed at the 2022 World Athletics Championships in Eugene, United States, from 15 to 24 July 2022. The Jamaica Athletics Administrative Association entered 65 athletes.
New Zealand sent a team of 20 athletes to the 2022 World Athletics Championships. Their best result was fourth place, achieved by Tom Walsh in the men's shot put.
Brazil competed at the 2022 World Athletics Championships in Eugene, United States, from July 15 to 24, 2022. The Brazilian Athletics Confederation entered 58 athletes.
Nigeria competed at the 2022 World Athletics Championships in Eugene, United States, from 15 to 24 July 2022. The Athletics Federation of Nigeria entered 24 athletes.
Switzerland competed at the 2022 World Athletics Championships in Eugene, United States, from 15 to 24 July 2022. The Swiss Athletics Federation entered 26 athletes.
New Zealand competed at the 2005 World Championships in Athletics held in Helsinki, Finland. They won one medal, a silver, which was won by Valerie Vili in the shot put. Vili originally won the bronze medal, but was upgraded to silver after original gold medallist Nadzeya Ostapchuk subsequently failed a drug test. They placed 26th on the medal table.
New Zealand competed at the 2003 World Athletics Championships. Their best placing was fifth, achieved by Valerie Vili in the Women's shot put. The men's 4x100m relay team broke the national record in their heat, but did not advance to the semi-finals.
New Zealand competed at the 2001 World Championships in Athletics held in Edmonton, Canada. They did not have any athletes placed in the top 8 in any event.
Kenya competed at the 2022 World Athletics Championships in Eugene, United States, from 15 to 24 July 2022. The country finished in 4th place in the medal table.
New Zealand competed at the 1999 World Championships in Athletics held in Seville, Spain. Their best performances were 5th and 7th.
