11 countries do not compete in the 2012 Olympics:
Abkhazia
East Timor (Democratic Republic of Timor-Leste)
Kosovo
Nagorno-Karabakh
Niue
Northern Cyprus
Sahrawi Arab Democratic Republic
Somaliland
South Ossetia
Transnistria
Vatican City (State of the Vatican City, Holy See)
In addition, South Sudan (Republic of South Sudan) does not have their own National Olympic Committee, but they are competing under the Independent Olympic Athletes banner.
There are 207 countries in the world at the time of the 2012 Olympics, 196 of which are competing. See reference questions linked.
I don't no cause I'm in a lol
(land of lollypops)
Kiribati, Afghanistan
Vatican City, Kosovo, South Sudan
You can bet North Korea and Myanmar will not send athletes to the Olympics.
Bulgaria is not participating in the 2012 Olympics.
A large number of countries did not win any medals. The related link lists the 85 nations that did win Olympic Medals
10
there are 204 nations competing in this olympics
kenya
18
london
204 countries will be competing.
205
Asia
204
more then 50
205
yes canada
Snowboarding will be part of the 2014 winter Olympics