The 1915 LSU Tigers football team represented the University of Louisiana (now known as Louisiana State University or LSU) as a member of the Southern Intercollegiate Athletic Association (SIAA) during the 1915 college football season.

Led by second-year head coach E. T. McDonald, the Tigers compiled an overall record of 6–2, with a mark of 4–0 in conference play, and finished third in the SIAA.

LSU played home games at State Field in Baton Rouge, Louisiana.

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