[20] Adeleke improved this mark to 50.33 s the same month, on 25 February at the Big 12 Indoor Championships in Lubbock, Texas, breaking the NCAA record and putting her 14th on the respective world all-time list.

[26] On 14 and 15 April, Adeleke obliterated both her national 200 m and 400 m records clocking 22.34 and 49.90 seconds respectively at the Tom Jones Memorial in Gainesville, Florida, becoming the first Irish woman to break the 50-second barrier at the longer distance.

[33] Adeleke ran her first race as a professional, representing Nike, at the Gyulai Istvan Memorial 2023, a World Athletics Continental Tour Gold meeting at Szekesfehervar, Hungary on 18 July.

[37] On 21 August, she finished second in her semi-final in 49.87 behind the Olympic silver medalist Marileidy Paulino of the Dominican Republic, registering the fourth fastest time overall.

[42] On 20 January, Adeleke broke her Irish national indoor 60m and 200m records at the Dr Martin Luther King Jr Collegiate Invitational in Albuquerque, New Mexico, running 7.15s and 22.49s respectively.

[43] Adeleke broke her own Irish 300 metres indoors record at the Milrose Games in New York on 11 February, running 36.42 sec to finish second behind Talitha Diggs (US).

[45] On 27 April, at the Texas Invitational in Austin, Adeleke won the open 100 metres for women in a personal best 10.84, ahead of Celera Barnes, Dina Asher-Smith and Julien Alfred.

First, the team of Cillin Greene, Adeleke, Thomas Barr and Sharlene Mawdsley set a new Irish record of 3.12.50 to win the mixed relay heat, with Belgium second (3.13.18) and Great Britain third (3.13.52).

Then, some 90 minutes later, the team of Sophie Becker, Adeleke, Phil Healy and Sharlene Mawdsley ran 3.24.38 - another Irish record - to take their heat ahead of Great Britain (3.24.89) and Cuba (3.31.56).

[51] At the European Athletics Championships in Rome on 7 June, Adeleke ran the second leg of the mixed 4 × 400 m relay, helping Ireland to win a gold medal, ahead of Italy and the Netherlands.

[54] In the final of the women's 4 by 400 relay on 12 June, Adeleke ran the second leg to help power Ireland to a silver medal in a new national record (3.22.71 s) behind the Netherlands (3.22.95 s).

[60] In the first heat of the semi-finals on 7 August, Adeleke, running in lane 8, finished second in 49.95, behind 2019 World champion Salwa Eid Naser of Bahrain (49.08), and qualified for the final.

On 10 August, in the final of the women's 4 by 400 m relay, Adeleke received the baton from lead runner Sophie Becker in sixth position, and moved to second place, before handing over to Phil Healy.

Sharlene Mawdsley ran the final leg, and Ireland just missed out on a bronze medal, finishing in fourth position in 3.19.90, a new national record, behind USA (3.15.37), the Netherlands (3.19.50) and Great Britain (3.19.72).