Gaynell Charles "Gus" Tinsley (February 1, 1915 – July 24, 2002) was an American professional football end and coach. He played for the Chicago Cardinals of the National Football League (NFL) from 1937 to 1938 and in 1940. He played college football for the LSU Tigers, where he was a consensus All-American. He was drafted in the second round of the 1937 NFL draft by the Cardinals, with whom he was an All-NFL selection in 1937 and 1938. During his three years in the NFL, Tinsley set or tied NFL single-season records with 674 receiving yards in 1937 and 41 pass receptions in 1938. He later served as the head football coach at LSU from 1948 to 1954. He was inducted into the College Football Hall of Fame in 1956 as a player.

Tinsley was born in Ruple, Louisiana and raised in Homer, Louisiana in the northern part of the state. He attended Louisiana State University where he played football and baseball and was selected as the captain of both teams. He was considered one of the greatest receivers in college football, earning consensus All-American honors in both 1935 and 1936. As a junior in 1935, Tinsley was named a first-team All-American by the Associated Press, United Press, Liberty (selected based on a poll of 1,521 varsity players in all parts of the country), Collier's Weekly, the Newspaper Editors Association, the International News Service, and The New York Sun. At the time, at age 19 he was one of the youngest ever named to the All-America team. In 1936, Tinsley repeated as a first-team All-American with each of these publications and also received the first-team designation from the Central Press Association (selected by the captains of more than 50 college football teams at "important universities and colleges throughout the United States"), and the Walter Camp Football Foundation.

Tinsley's profile at the College Football Hall of Fame describes him as such: "Tinsley was a magnificent athletic specimen, standing 6-0, and weighing 196-pounds, size he used equally well as a defensive stalwart who was a blocking master." As a sophomore in 1934, Tinsley had a 65-yard pass reception, thrown by halfback Abe Mickal, against Southern Methodist University, which stood as a record for several years as "the longest pass in Southern football history." Tinsley's coach at LSU, Bernie Moore, once said, "Tinsley could have made All-American at any position. He was so tough, he made blockers quit. He's the greatest lineman I ever saw."

Tinsley concluded his college career by playing in the Chicago College All-Star Game, an annual game between college all-stars and an NFL team. Tinsley scored the only points of the game on a 47-yard touchdown pass from Sammy Baugh, as the college players defeated the Green Bay Packers, 6–0. This was the first victory for the college players against the professionals in the series.

In 1993, LSU selected its all-time team as part of the celebration of the centennial of LSU football. Tinsley was "the only unanimous choice" for LSU's "Early Years Team of the Century." Upon his death in 2002, LSU Sports described his contributions to the school's football teams of the mid-1930s as follows:

Tinsley is widely considered to be among the finest athletes to ever play at LSU. The star end led the Tigers to their first two SEC titles and played in two Sugar Bowls. He earned All-SEC and All-American honors in 1935–36 for his ability to dominate a game on both sides of the ball. In 1936, he was also second in balloting for national MVP honors. ... At 6-3, 215 pounds, Tinsley was considered to the prototype end of his era because of his mobility.

Tinsley was drafted by the Chicago Cardinals in the second round as the 12th overall pick in the 1937 NFL draft. He played for the Cardinals for three years: in 1937, 1938 and 1940. As a rookie in 1937, Tinsley set an NFL record with 675 receiving yards. He also ranked among the NFL's 1937 leaders in several categories, including 36 receptions (second in the NFL), 675 receiving yards (first in the NFL), 677 total yards from scrimmage (second in the NFL), five receiving touchdowns (second in the NFL), 18.8 yards per reception (first in the NFL) and 61.4 receiving yards per game (first in the NFL). At the end of the 1937 season, Tinsley was selected as a first-team All-NFL player by the United Press, the NFL, New York Daily News, and Collyers Eye magazine.

Tinsley twice set the record for the longest pass reception in NFL history. He set the mark first in 1937, when he caught a 97-yard pass from Pat Coffee for a touchdown against the Chicago Bears. He broke his own record the following season, against the Cleveland Rams in the Cardinals' final game, with a 98-yard touchdown reception from Doug Russell. Several NFL receivers have since recorded 99-yard receptions, but Tinsley's 98-yarder remains a Cardinals franchise record (although it has been tied twice).