The 1968 Men's National Tennis League (NTL) [1] was the inaugural series of professional tennis tournaments founded by George McCall, among others: Rod Laver, Roy Emerson, Ken Rosewall, Andrés Gimeno, Pancho Gonzales and Fred Stolle.

In 1967 two new professional tennis organizations were formed: the National Tennis League,[2] organized by former U.S. Davis Cup captain George MacCall, and World Championship Tennis (WCT), which was founded by New Orleans promoter Dave Dixon and funded by Dallas oil and football tycoon Lamar Hunt.

In 1968 Men's National Tennis League offered prize money totaling $400,000 USD.

[3] It began in March with the opening tournament held in São Paulo, Brazil that was won by Rod Laver and ended with the final tournament held in Lima, Peru in November that was won by Fred Stolle.

This is the complete schedule of events on the 1968 National Tennis League, with player progression partially documented until the quarterfinals stage.