What is the largest living organism currently known to man?

The largest living organism currently known to man is the Honey Fungus. This organism is a type of fungus that spreads through an extensive underground network of thread-like structures called mycelium, which can cover vast areas of land. The largest known Honey Fungus colony measures over 2.4 miles (3.8 kilometers) across in the Blue Mountains of Oregon, USA. Its exceptional size is attributed to its ability to grow and spread over the years, making it the largest living organism known today.