Frederick Lorz (June 5, 1884 – February 4, 1914) was an American long distance runner who won the 1905 Boston Marathon.

[3] Lorz, listed as representing the Mohawk Athletic Club, was named as one of 19 "probable competitors" in the event.

After spectators claimed he had not run the entire race, Lorz was confronted by furious officials with these allegations, upon which he admitted his deception: despite his claims he was playing a practical joke, the AAU responded by banning him for life, but this was commuted to six months on February 19, 1905, after Lorz formally apologized and it was found that he had not intended to defraud.

[4][5] Thomas Hicks was the actual winner of the 1904 Olympic marathon, though he too had an unusual race, walking part of the route, being carried by his trainers, and being dosed with strychnine, which has since been banned; among the 32 runners that started, he was one of several who came near death, along with William Garcia.

[6][7] Lorz was suspended a second time by the Amateur Athletic Union for participating in an unsanctioned meet at the games of the Thomas Jefferson Club at Witzel's Grove, College Point, Long Island, New York on August 23, 1905.