Lieutenant Colonel Arthur Brent Alphin (born September 5, 1948) is a retired United States Army officer and military historian.

[1] He is the founder and owner of A-Square, manufacturer of American hunting rifles.

[2][3] He taught military history at West Point.

Since retiring he has co-authored several books with his wife and children's author Elaine Marie Alphin.

He also assisted ghostwriter Lisa Harkrader in writing Animorphs #51: The Absolute, by providing her with information about tanks and reading over the book to check for errors.