Martin William Liquori (born September 11, 1949) is a retired American middle distance athlete.

Liquori rose to fame when he became the third American high schooler to break the four-minute mile by running a 3:59.8 in 1967, three years after Jim Ryun first did it.

In 1977 he was ranked number 1 in 5000 meters and set a U.S. record of 13:15.1 while finishing second to Miruts Yifter in the inaugural World Cup.

Liquori did commentary at the Munich, Montreal, Sidney, Barcelona, Seoul and Athens Olympic Games and the New York and Boston Marathons.

Liquori produced and hosted “Running and Racing” on ESPN for 14 years and Fitness Adventures on the Outdoor Life Network.