| All Africa Team Championships | 02/15 15:00 | - | Mammeri, Koceila v Victor Ikechukwu | L | 0-2 | |
| Thomas Cup | 05/10 07:00 | - | Zhao, J. P. v Mammeri, Koceila | L | 2-0 | |
| Korea Masters | 04/13 01:00 | 5 | Mammeri, Koceila v Weng, H. Y. | L | 0-2 | |
| Korea Open | 04/06 01:20 | 5 | 나라오카, 고다이 v Mammeri, Koceila | L | 2-0 | |
| Swiss Open Qual | 03/22 12:00 | - | Mammeri, Koceila v 하이노, 아이크카 | L | 0-2 | |
| All Africa Team Championships | 02/17 06:20 | - | Appiah, Melvin v Mammeri, Koceila | W | 0-2 | |
| Orleans Masters 2019, MS, Qualification | 03/23 10:20 | 5 | Mammeri, Koceila v Kim Kristensen, D. | L | 0-2 | |
| All Africa Individual Championships | 02/14 16:00 | - | Salah, Ahmed v Mammeri, Koceila | W | 1-2 | |
| All Africa Individual Championships | 02/14 09:00 | - | Nkonomo Bengono, Felix Dureil v Mammeri, Koceila | W | 0-2 | |
| All Africa Team Championships | 02/10 09:00 | - | Mammeri, Koceila v Khayati, Ouzaier | W | 2-0 | |
| Italian Int. Qual | 12/12 12:25 | - | Mammeri, Koceila v 머클, 아르나우드 | L | 0-2 | |
| Indonesia Masters XD | 05/23 13:30 | 1 | 이바노브 블라디미르 v Mammeri, Koceila | L | 2-0 |
Koceila Julien Mammeri (born 23 February 1999) is a French-Algerian badminton player who trained at the Oullins club in France. In the junior event, he was the third place at the Portugal International tournament in the boys' doubles event. He won gold medals at the 2017, 2019, 2020, 2021 and 2022 African Championships for men's doubles with his partner Youcef Sabri Medel, and in 2018 and 2019 for mixed doubles with Linda Mazri, and also in 2021 and 2022 for mixed doubles with Tanina Mammeri. He claimed the mixed doubles gold medals at the 2019 African Games with Mazri and in 2023 with Tanina Mammeri. He also won another gold in the men's doubles in 2023 with Medel.