The 2004 Indian general election polls in Tamil Nadu were held for 39 seats in the state.

The 2 larger partners Dravida Munnetra Kazhagam (DMK) (16) and Indian National Congress (INC) (10) won the majority of seats, with the junior partners Pattali Makkal Katchi (PMK) (5) and Marumaralarchi Dravida Munnetra Kazhagam (MDMK) (4) winning the rest.

The DPA was formed, because DMK, PMK and MDMK, left the NDA mostly on the Ayodhya issue and created an alliance that supported the UPA.

The NDA paid a price for it, when their BJP-AIADMK alliance couldn't even win a seat in this state.

[1] Note: The janata party and puthiya Needhi Katchi contested in janata party's symbol †: Seat change represents seats won in terms of the current alliances, which is considerably different from the last election.