g MTR 
Causeway Bay is on the Island Line - with multiple station exits.

g Tram
Causway Bay has tram services To Kennedy Town, Happy Valley, or Whitty Street
View Tram Route 
For detailed routes see the Hong Kong Tramways Route Planner 
g Bus
Kowloon Motor Bus Company operates services from Causeway Bay to other Islands / N.T.
Search Services 
g Bus
A large array of routes are provided by Citybus and Firstbus.
New World First Bus: 2X, 2A, 2, 8, 23, 25, 38, 42, 106, 112, 116, N122, N8
Citybus: 5, 8X, 10, 11, 72, 92, 592, 103, 170, 619, 690, 962, N962
View Services 
g Mini Bus
Those in the know... will know there are two types of minibus services:
Red Roof - These follow relativley undocumented routes, Check the front and flag them down if they are heading where you need.
Services include:
- Sai Wan - Causeway Bay
- Causeway Bay - Shau Kei Wan
- Temple Hill (Tsz Wan Shan) - Causeway Bay
Green Roof - These are the documented and numbered routes, these typically have fixed pick up points, however they may be flagged down when there is space on board.
4A、4B、4C、5、10、11、14M、21A、21M、25、28、30、31、36X、39M、40、56、69X, 9
View Services 