Season 3:
1: "A Tale of Two Cities" (Jack Centric) [x]
2: "The Glass Ballerina" (Sun Centric) [x]
3: "Further Instructions" (Locke Centric) [x]
4: "Everyman for Himself" (Sawyer Centric) [x]
5: "The Cost of Living" (Eko Centric) [x]
6: "I Do" (Kate Centric) [x]
7: "Not in Portland" (Juilet Centric) [x]
8: "Flashes Before Your Eyes" (Desmond Centric) [x]
9: "Stranger in a Strange Land" (Jack Centric)[x]
10: "Tricia Tanaka is Dead" (Hurley Centric) [x]
11: "Enter 77" (Sayid Centric) [x]
12: "Par Avion" (Claire Centric) [x]
13: "The Man from Tallahassee" (Locke Centric) [x]
14: "Exposé" (Nikki/Paulo Centric)[x]
15: "Left Behind" (Kate Centric)
16: "One of Us"(Juliet Centric)
17: "Catch-22" (Desmond Centric)
18: "D.O.C." (Jin Centric)
19: "The Brig" (Jack Centric)
20: "The Man Behind the Curtain" (Others/Dharma Centric)
21: "Greatest Hits" - (Charlie Centric)
22: TBA (Ben Centric)*
23: TBA (Ben Centric)*

Key:
? or TBA is unknown.
Bold is speculation.
* is rumored.
[x] is already aired.