Here are the top 5 most subscribed YouTube channels as of January 2021:

1. T-Series – 107 million subscribers
2. PewDiePie – 105 million subscribers
3. Cocomelon – Kids Songs – 85 million subscribers
4. SET India – 75 million subscribers
5. WWE – 71 million subscribers

Note that these numbers are constantly changing as channels gain and lose subscribers over time. These rankings are based on data from 2021, so the current numbers may be different.