The official servers for NattoSumo and the biggest Discord sumo server there is! 6000+ members, general sumo chat and media as well as links to archives of Natto’s videos available for download. Highly recommended.
We have a Guilded server too (a Discord competitor app: https://www.guilded.gg/i/Emzg3m42) but it's basically dead at this point, so I would suggest joining the Discord.
https://discord.com/invite/Wg4DsMt
The central hub for sumo on Discord. Linked to r/Sumo on Reddit, this is a very active server dedicated to sumo in general. Highly recommended.
https://discord.com/invite/eT5rkeY
The official server for Road to Yokozuna, a sumo-themed dice-based RPG (but played on Discord!) If you’re a fan of tabletop gaming and roleplaying, check it out!
https://discord.com/invite/MkrdQ3t
The official Discord server for Karla Sumoist (formerly KarlaMarx), who streams sumo live on Twitch (see the “Match Videos and Streams” section of this doc for a link to her stream).
A server run by MidnightAgent, a mod from Karla's channel who is now doing their own streams.
The channel for So Desu Ne/MbovoSumo. It was closed to new people for ages but it seems like it's open for now? Join while you can!
The Spanish language community server for Leonishiki, aka. Eduardo de Paz, who is a Spanish language broadcaster for Eurosport amongst other places. Un servidor en Español!
https://discord.com/invite/9KMkm3PJcB
A server dedicated to playing fantasy league, but with sumo! Join existing leagues or create your own.