| 2026-05-30 | UFC Fight Night: Song vs. Figueiredo | Welterweight | Jake Matthews def. Carlston Harris | Decision (unanimous) (30–25, 30–27, 30–27) | 3 | 5:00 |
| 2025-01-11 | UFC Fight Night: Dern vs. Ribas 2 | Welterweight | Santiago Ponzinibbio def. Carlston Harris | TKO (punches) | 3 | 3:13 |
| 2024-05-18 | UFC Fight Night: Barboza vs. Murphy | Welterweight | Khaos Williams def. Carlston Harris | KO (punch) | 1 | 1:30 |
| 2023-08-05 | UFC on ESPN: Sandhagen vs. Font | Welterweight | Carlston Harris def. Jeremiah Wells | Technical Submission (anaconda choke) | 3 | 1:50 |
| 2023-03-11 | UFC Fight Night: Yan vs. Dvalishvili | Catchweight | Carlston Harris def. Jared Gooden | Decision (unanimous) (30–27, 30–27, 30–27) | 3 | 5:00 |
| 2022-02-05 | UFC Fight Night: Hermansson vs. Strickland | Welterweight | Shavkat Rakhmonov def. Carlston Harris | KO (spinning hook kick and punches) | 1 | 4:10 |
| 2021-09-18 | UFC Fight Night: Smith vs. Spann | Welterweight | Carlston Harris def. Impa Kasanganay | TKO (punches) | 1 | 2:38 |
| 2021-05-08 | UFC on ESPN: Rodriguez vs. Waterson | Welterweight | Carlston Harris def. Christian Aguilera | Technical Submission (anaconda choke) | 1 | 2:52 |