Proline is an amino acid. Proline (data page)
Proline or Pro-Line may also refer to:
Proline FC, football club in Uganda ProLine (company), an electronics brand Pro-Line Racing, a manufacturer of radio-controlled car accessories Sport Select, Canadian betting games also known as Pro-Line in some areas Proline, a line of prosumer camcorders manufactured by Panasonic ProLine, a software package with a Unix-like shell, used to run bulletin board systems on Apple II computers