Stephen Lam Sui-lung was the Chief Secretary for Administration of Hong Kong and Secretary for Constitutional and Mainland Affairs.

The secretary for Constitutional and Mainland Affairs is the head of the Constitutional and Mainland Affairs Bureau in Government of Hong Kong, which is responsible for promoting the Basic Law, constitutional affairs, electoral development, and coordinate liaison between the Hong Kong government and the relevant mainland China authorities, as well as to promote various regional cooperation initiatives between Hong Kong and the mainland. Prior to 2007, this post was known as the Secretary for Constitutional Affairs.