Q[Switch] How many controllers can I pair with my console?
Before using a controller for the first time, you'll need to pair it with your Nintendo Switch console. You can pair up to 10 controllers with one console.
Pairing an 11th controller results in the first controller that you paired being automatically unpaired. In order to use the first controller again in this instance, you would have to pair it again.
Additionally, although you can pair up to 10 controllers per system, you can only connect up to eight at any given time. More details here.
* The number of players who can actually play at any one time depends on the title and game mode being used.
* Joy-Con (L) and (R) are each counted as one controller. Even when used together with a Joy-Con Grip, the left and right controllers both count individually (meaning two controllers in total).