Res Publica Party

| international = International Democrat Union

| european = European People's Party

| europarl = EPP–ED

| colours = Blue, Red

| headquarters = Narva mnt 7<br />Tallinn 10117

| website = www.respublica.ee

Res Publica Party () was a political party in Estonia that self-identified as conservative. Established as a party on 8 December 2001, the political organisation Res Publica was founded already as early as 1989 and existed as a community of young conservatives, mostly associated with the Pro Patria Union party during the 1990s. Res Publica was a member of the EPP (European People's Party) on the European level. It merged with Pro Patria Union in 2006 to form the Pro Patria and Res Publica Union.

The party was founded under the name Union for the Republic – Res Publica (Ühendus vabariigi eest – Res Publica), but was commonly referred to as simply Res Publica and changed its name to Res Publica Party.

The party won its first parliamentary elections (in 2003) after being established. Their election slogans were "Vote for new politics" ("Vali uus poliitika") and "Choose order" ("Vali kord").