Salwa Eid Naser (née Ebelechukwu Agbapuonwu, born 23 May 1998)[1] is a Nigerian-born Bahraini sprinter who specialises in the 400 metres.

[2] Naser served a competition ban from 30 June 2021 to February 2023 due to an anti-doping rule violation relating to whereabouts failures.

[3] Salwa Eid Naser was born Ebelechukwu Antoinette Agbapuonwu on 23 May 1998 in Onitsha, Anambra, to a Nigerian mother and Bahrain-born father.

At age 11, in her first competitive race in school, she won the 100 m, and then later the 400 m. Her teacher insisted that she would make a good 400 m runner, so she started to focus on the distance.

[1][4][9] Based in Riffa in Bahrain's Southern Governorate, Naser had her first success at the 2014 Arab Junior Championships, where she was a gold medallist in both the 200 m and 400 m. Following this achievement, she began to take the sport more seriously and set a new personal best of 54.50 seconds at the Asian Trials for the 2014 Youth Olympics.

Naser steadily improved her best further at the Olympics, recording 53.95 s in the first round before taking a silver medal behind Australia's Jessica Thornton with a much improved time of 52.74 s.[7] The sprinter then began working with former Bulgarian athlete Yanko Bratanov, who also coached fellow Nigerian-Bahraini athletes Kemi Adekoya and Samuel Francis (banned / disqualified for doping)[10][11] among others.

A patient run in a tight hijab, what was her own decision, saw her overhaul the more favoured American Lynna Irby in the final stages of the race, and she achieved a lifetime best of 51.50 s to take the gold medal.

[7] The gold medal made her the second-ever Bahraini woman to win a global-level title, after senior world champion Maryam Yusuf Jamal.

[13] Her tactical running was praised by USA's decathlon world record holder Ashton Eaton, who invited her on an all-expenses paid trip to train with him for three days.

Competing in the 400 m against 2012 Olympians Bianca Răzor and Nataliya Pyhyda, she improved to win a gold medal with a world youth-leading and national under-20 record time of 51.39 s, becoming the youngest ever winner of that title.

She was last midway through the race, and when she turned for home, she was still only fourth, eventually beating Allyson Felix by 0.02 and being beaten only by Phyllis Francis (photo finish).

[23] At age 19, it made Naser the youngest woman ever to reach the podium over 400 m at a World Championships; she also thrice broke the Bahraini national record.

In November 2024, it was announced that Eid Naser had signed up for the inaugural season of the Michael Johnson founded Grand Slam Track.