Best: Youtube Player Unblocked

Search for "Invidious Instances" or "Piped Instances." Developers keep updated lists of working URLs.

If you don't want to use a dedicated player, web proxies like or Hide.me can act as a middleman. You enter the YouTube URL into the proxy site, and it fetches the video for you. youtube player unblocked best

It has dozens of "instances" (different URLs). If your admin blocks one, you can simply find another. Search for "Invidious Instances" or "Piped Instances