John Matthew Wightman (October 2, 1938 – January 5, 2017) was an American politician from the state of Nebraska. He served two terms, from 2007 to 2015, in the Nebraska Legislature, representing a district in the central part of the state. Wightman was a member of the Republican Party. He was also mayor of Lexington, Nebraska.
Wightman died on January 5, 2017 of respiratory failure at the age of 78 in Lexington, Nebraska.