Brendan Allen, detto «All In», è un lottatore di MMA della categoria pesi medi. Il suo record nelle arti marziali miste è 27–7 (vittorie–sconfitte–pareggi). Scheda: 30 anni, altezza 188 cm, allungo 191 cm.
| Esito | Avversario | Metodo | Evento | Data |
|---|---|---|---|---|
| Win | Edmen Shahbazyan | Decision (unanimous) | UFC Fight Night: Muhammad vs. Bonfim | June 6, 2026 |
| Win | Reinier de Ridder | TKO (corner stoppage) | UFC Fight Night: de Ridder vs. Allen | October 18, 2025 |
| Win | Marvin Vettori | Decision (unanimous) | UFC 318 | July 19, 2025 |
| Loss | Anthony Hernandez | Decision (unanimous) | UFC Fight Night: Cejudo vs. Song | February 22, 2025 |
| Loss | Nassourdine Imavov | Decision (unanimous) | UFC Fight Night: Moicano vs. Saint Denis | September 28, 2024 |
| Win | Chris Curtis | Decision (split) | UFC Fight Night: Allen vs. Curtis 2 | April 6, 2024 |
| Win | Paul Craig | Submission (rear-naked choke) | UFC Fight Night: Allen vs. Craig | November 18, 2023 |
| Win | Bruno Silva | Submission (rear-naked choke) | UFC on ABC: Emmett vs. Topuria | June 24, 2023 |
| Win | André Muniz | Submission (rear-naked choke) | UFC Fight Night: Muniz vs. Allen | February 25, 2023 |
| Win | Krzysztof Jotko | Submission (rear-naked choke) | UFC Fight Night: Dern vs. Yan | October 1, 2022 |
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