C66
# C66

C66 or C-66 may refer to:

* C-66 (Michigan county highway)
* Berlin Defence (chess), a chess opening
* Caldwell 66, a globular cluster
* Caudron C.66, a French biplane
* HMCS Uganda (C66), later renamed HMCS Quebec, a Fiji-class cruiser of the Royal Canadian Navy
* Lockheed C-66 Lodestar, an American transport aircraft
* Migration for Employment Convention, 1939 of the International Labour Organization
* Siemens C66, a mobile phone
