E99 can refer to:
*
King's Indian Defense
The King's Indian Defence (or KID) is a common chess opening. It is defined by the following moves:
: 1. b:Chess Opening Theory/1. d4, d4 b:Chess Opening Theory/1. d4/1...Nf6, Nf6
: 2. b:Chess Opening Theory/1. d4/1...Nf6/2. c4, c4 b:Chess Open ...
, Encyclopaedia of Chess Openings code
*
E 99 road (United Arab Emirates), a road in the United Arab Emirates
*
Embraer R-99
The Embraer R-99 is the Brazilian Air Force (FAB) military designation of the EMB-145-RS. Various models of the aircraft have been produced to perform special mission duties, including the E99 for airborne early warning and control (AEW&C) miss ...
, an aircraft type
*
European route E99, European road in Turkey
* Element 99, a fictional element in the video game ''
Singularity''.
{{Letter-number combination disambiguation