Dave Armstrong is an amateur welterweight MMA fighter out of Northern Ireland representing OMMA – Team Ryano Omagh. He has competed in regional promotions across the UK and Ireland, compiling an amateur record of 2‑2‑0. He most recently fought at IÚR Fighting Championship 16 in September 2025, where he defeated Dylan Keogh‑Evans by unanimous decision. His earlier bout includes an amateur decision loss to Oisin Moloney in November 2024.