I have watched a lot of maths videos on the internet. The medium of YouTube is quite well suited to maths; maths books are frequently either boring or are really about maths history/psychology/sociology. People sometimes ask me for recommendations of maths channels and videos to watch, so I thought I would write this guide to have something to point them to. There are a number of channels that are good for formal education, like Khan Academy or Organic Chemistry Tutor. There are also other channels that upload high-quality lectures, like the Royal Institution and the channels of various universities. But I don’t even study maths at university, so here I’m only going to discuss channels I watch for fun.