Iolo's Secret Life of Birds
2010
Himself - Presenter
Winterwatch
2013
Self - Presenter
Springwatch
2005
Autumnwatch
2007
Self
Wild Wales
Presenter/Narrator
Wonders of the Great Barrier Reef with Iolo Williams
2018
Black Waters: The Sea Empress Disaster
2026
Iolo's Borderlands
2023
Iolo: The Last Wilderness Of Wales
2020
Iolo's Anglesey
2022
Iolo's River Valleys
2025
