Terrell Owens -- Furious Over Junior Seau

Terrell Owens is pissed that Junior Seau's family won't be able to speak live at the NFL legend's Hall of Fame induction ceremony ... saying the whole thing is "terrible."

Seau is set to be posthumously enshrined in Canton in August -- and while the family will be able to make a video message to be played during the ceremony, they're pissed ... claiming they should be able to give a live speech.

And when we saw Owens over the weekend -- T.O. told TMZ Sports, he very strongly agrees with Seau's family.

"It's a time to recognize this guy and his accomplishments. If it wasn't for his family, there wouldn't be no Junior Seau. I think it's terrible if you ask me."