Lisa Lampanelli is demanding a "BIG F**KING APOLOGY" from NBC ... claiming the network completely disrespected her at the NY Knicks game last night ... in front of thousands of people.
Lisa -- who was just announced as a contestant on the upcoming "Celebrity Apprentice" -- had just completed a hardcore day of promoting the show ... when she WENT OFF on the peacock.
Lampanelli says she was invited to Madison Square Garden along with two of her co-stars -- former Miss Universe Dayana Mendoza and "Real Housewives" star Teresa Giudice.
But when they got the tickets, Lisa says Dayana and Teresa were placed in the front row ... while Lisa was forced to sit all the way in the back. Obviously, Lisa was PISSED.
She unloaded, "You think anyone is watching that 'Celebrity Apprentice' for anybody except me and a couple other people who really keep the ball rolling?"
"I'll expect my gift basket with your apology and some GOOD Knicks tickets tomorrow .. 'cause I killed myself for you for 18 hours today."
And the worst part of all ... the front row seat next to Teresa and Dayana was EMPTY!!!