In Nolan's Dark Knight Trilogy,how many people in total actually know that Bruce Wayne is Batman?
By my count, at least ten. Six are still living by the end of the third movie.
- Rachel (dead)
- Selina Kyle
- Gordon (finds out at end of 3rd movie)
- John Blake
- Coleman Reese
- Ra's al Ghul (dead)
- Talia (dead)
- Bane (dead)
In Batman Begins and The Dark Knight Rises, it seems that other members of the League of Shadows know that Wayne is Batman. We don't know how many or whether they surived. So, the number could be higher.
Within the Dark Knight Trilogy, Batman's identity is well concealed.
Alfred and Lucius Fox obviously know since they're working with him, as does Ra's al Ghul, Bane and the other members of the League of Shadows such as
Since they were instrumental in his training.
Jim Gordon also works out his identity at the end of the film series, as does John Blake and Selina Kyle. Coleman Reese strongly suspects (albeit this knowledge isn't explicitly confirmed within the film) and Rachel also learns his identity. As Rogue Jedi points out in his comment, Bruce Wayne is also aware of Bruce Wayne's secret identity.
11 named individuals, but potentially dozens of others.