Which sport has the highest number of officials to players?

I am farely confident that it would be hockey in the NHL, they have 3-4 officials on the ice at the same time as a max of 11 players.

Nope. It would have to be Tennis. Maximum of 4 players at one time, with an umpire assigned to each line in an ATP match.

Ah yes, that's right. I forgot about tennis. Good work.