The invention describes albumin fusion proteins comprising growth hormone and serum albumin. The invention also describes nucleic acid molecules encoding the albumin fusion proteins of the invention, as well as vectors containing these nucleic acid molecules, host cells transformed with these vectors, and methods of making the albumin fusion proteins of the invention and using these nucleic acids, vectors, and/or host cells. Additionally, the invention describes compositions comprising the albumin fusion proteins, and methods of treating patients in need of growth hormone, comprising administering the albumin fusion proteins of the invention.