There doesn't appear to be a list of large format channels. The ones below are entirely or significantly about large format. I've omitted channels with only a few LF videos. Also, the list only includes channels that have been active in roughly the last year. What channels are missing?
Many thanks to @Dan6077 for doing the coding to make the channel names into links to the channels. As everyone knows, links can fail over time. If someone has a problem with one, please send me a personal message.
Camera Makers
Chamonix View Cameras (Hugo Zhang)
Chroma Cameras (Steve Lloyd)
Gibellini Camera (Alessandro Gibellini)
David Hancock (5119 Pinhole Cameras)
The Homemade Camera Podcast (Nick Lyle, Graham Young, Ethan Moses)
Intrepid Camera Co.
Linhof Cameras Made in Munich
Drew Nikonowicz (Standard Cameras)
StenopeiKa Large Format Cameras (Samuele Piccoli)
Photographic Materials
Ilford Photo
Lost Light Art (Nejc Urankar, Zebra Dry Plates and Holders)
Organisations
Aperture Foundation New York
Photographers
Australia
Peter Guo Photography
Matt Weddis
Austria
Markus Hofstätter
Canada
Analogue Andy アナログ アンディ(Andrew O'Neill)
Bob Carnie
Todd Korol
Finland
Shoot on Film by Ari Jaaksi
France
Antoine Dombois
Germany
Fotografia in Grande e Ultra Grande Formato (Marco Annaratone)
Italy
Lina Bessonova
Giulio Speranza
Japan
備前中納言
Singapore
Analogue Photography Talk (Cheng Qwee Low)
Melvin HJ Tan
Slovenia
Lost Light Art (Nejc Urankar)
Borut Peterlin Photography
South Korea
유별남
Spain
Nico's Photography Show (Nico Llasera)
United Kingdom, England
Guy Bellingham Photography
Will Gudgeon
Martin Henson
Russell Jackson
Negative Feedback (George Muncey)
Steve O’Nions
Christopher Pohl
Craig Prentis
United States
Bryan Birks
Alan Brock Images
Nick Carver
Chris Darnell
Matt Day
Marco Fantin
Jim Fitzgerald
Absolutely Analog (Francesco Fragomeni)
Have Film, Will Travel (Bryan Garris)
Andres Hernandez
Ben Horne
Tim Layton
Paul Lender
Mat Marrash
Robbie Maynard Creates
Drew Nikonowicz
Imran Nuri
Riding the Edge Photography (David Patton)
Tony Santo Photography
Craig Sheaks
Steve Sherman's Power of Process
Alec Soth
Scott Walton
Hugo Zhang
Bookmarks