In this paper we investigate whether independent directors’ attendance at board meetings enhances investor protection using a difference-in-difference approach. We find that independent directors’ attendance alleviates tunneling. This effect is more pronounced in non-state-owned enterprises than in state-owned enterprises. The reinforcement of external supervision substitutes for the role of independent directors’ attendance and this substitution effect is more significant in non-SOEs. Together, these results imply that independent directors’ attendance at board meetings can play an important role in protecting investors, especially (...) in non-SOEs and when external supervision is weak. This paper sheds new light on independent directors’ function in corporate governance, and has implications for institutional improvements. (shrink)