C99 (disambiguation)

C99 is a past version of the C programming language standard.

C99 or C-99 may also refer to:

Science and technology

 * C99, a C compiler for the TI-99/4A home computer
 * C99, a fragment of the amyloid precursor protein created by beta-secretase
 * C99Shell, also known as C99, is a malicious web shell

Other uses

 * C99, a model of Beechcraft Model 99 aircraft
 * Convair C-99, a military aircraft
 * Ruy Lopez (ECO code), a chess opening
 * Minimum Wage Fixing Machinery (Agriculture) Convention, 1951 (ILO code)
 * C99, is also known as Coalsack Nebula