| John B. Longwell | |
| Birth Date: | 23 October 1879 |
| Birth Place: | New Windsor, New York, U.S. |
| Player Sport1: | Football |
| Player Years2: | 1902 |
| Player Team2: | Washington & Jefferson |
| Player Years3: | 1905–1906 |
| Player Team3: | Penn |
| Player Positions: | Fullback, halfback |
| Coach Sport1: | Football |
| Coach Years2: | 1909 |
| Coach Team2: | Howard (AL) |
| Coach Years3: | 1910 |
| Coach Team3: | Wittenberg |
| Coach Years4: | 1911 |
| Coach Team4: | Howard (AL) |
| Coach Years5: | 1916–1917 |
| Coach Team5: | Howard (AL) |
| Coach Years6: | 1919 |
| Coach Team6: | NYU |
| Coach Sport7: | Basketball |
| Coach Years8: | 1916–1917 |
| Coach Team8: | Howard (AL) |
| Admin Years1: | 1916–1917 |
| Admin Team1: | Howard (AL) |
| Overall Record: | 20–22–3 (football) 3–5 (basketball) |
John Burt Longwell (October 23, 1879 – May 18, 1952) was an American college football player and coach, college basketball coach, and dentist. He served as the head football coach at Howard College—now Samford University—in Birmingham, Alabama during the 1909, 1911, 1916 and 1917 seasons and at New York University (NYU) in 1919. Longwell was also the head basketball coach at Howard during the 1916–17 season, tallying a mark of 3–5.
Longwell was hired as Howard College in 1909.[1] His first football team went 5–2–1 and outscored opponents 82 to 30 over eight games. James C. Donnelly coached the next season. During the 1910 season, he served as an interim coach at Wittenberg College in Springfield, Ohio after the ousting of head coach Leo DeTray.[2] [3] When Longwell returned to Howard the following season, the 1–6–1 1911 Bulldogs only managed six points to their opponents' 158 in an eight-game season. B. L. Noojin coached the next three seasons, succeeded by Eugene Caton in 1915. Longwell returned in 1916 and guided the Bulldogs to a 6–4 record (146 points scored to 92 points against). He coached the first five games of the next season before resigning. C. W. Streit completed the 3–3–1 season. His overall record with the Bulldogs was 14–14–3 in 31 games.[4]
Longwell was a graduate of the dental department at the University of Pennsylvania, class of 1909. He later worked as a dentist in New York.[5]