In the tv show Lost how many groups of people are there?

there is the others with like ben richard and juliette
there is the dharma initiative which ben usd to be a member of and the survivers were members of in season 5
there are the freighter group although they are all but dead now
and there is the french group wich roussoue is the last surviving member of

i think thats about it

Lots!

Plane Crash Survivors:

Fuselage – 48 survivors initially
Cockpit – 1 survivor initially
Tail Section- 20 survivors initially

Island Inhabitants:

The Others- Unknown how many
-Also, Temple Others, same group, different faction
DHARMA Initiative- All dead by the time of the plane crash
The French Team- All dead by the time of the plane crash, except for Danielle Rousseau who lives in solitary
"Adam and Eve"- two skeletons found in the caves, unknown who they are, dead for at least 50 years before the plane crash

Outsiders:

The KAHANA- Freighter people that came to the Island
Illana and Bram’s People- Came aboard Flight 316, have a connection to the Island and the Others, may actually BE Others
Flight 316- a second plane crash to the Island