"I feel good and I fully intend on winning the next battle," Beliveau, 68, said in a statement issued by the Canadiens.
"During my treatments, for the next few months, I very humbly ask everyone to respect the privacy of my family and myself."
Canadiens president Pierre Boivin said in the statement that doctors discovered the tumour when Beliveau went for his annual medical examination.
Former Montreal Canadiens great Jean Beliveau will undergo surgery for a tumour in his neck. (CP Photo)
Beliveau played 20 years for the Canadiens and won the Stanley Cup 10 times.
When he retired in 1971, Beliveau was appointed vice-president, a position he held until 1993. He currently is an ambassador for the NHL team.