Unbelievable moment for Senators star Bobby Ryan -- who returned to the ice in Ottawa on Thursday after taking 100 days off to get sober ... and he pulled off a HAT TRICK!!!
The 32-year-old had stepped away from the team on Nov. 20 to focus on battling alcoholism through the league's substance abuse program.
Tuesday marked 100 days of sobriety -- and Thursday night was Ryan's first game back at the Canadian Tire Centre ... where he was welcomed by adoring fans.
The energy in the place was insane -- many fans holding signs showing their support for Ryan, who was clearly touched by the love.