Muhammad Isa Ahmad (born 1998) is a Bruneian swimmer. He competed in the 50 m and 100 m breaststroke events at the 2012 FINA World Swimming Championships (25 m) and in the 50 m and 100 m breaststroke events, the former of which he currently hold the national record with a time of 31.29 seconds, at the 2013 World Aquatics Championships. In 2019, he represented Brunei at the 2019 World Aquatics Championships held in Gwangju, South Korea and he competed in the men's 50 metre breaststroke and men's 100 metre breaststroke events.