Oldest capital derby or Oldest Sofia derby is the name of the football match between the oldest still existing teams in the capital of Bulgaria: Slavia Sofia and Levski Sofia. Matches between the two sides have been played almost continuously ever since a football league in Bulgaria has existed. The two teams regularly competed for the title before World War II. Levski have never been relegated from the top flight, while Slavia have missed only one season, for political reasons. This is the most frequently played match in Bulgarian football.

Established in 1913 and 1914, respectively, Slavia and Levski are the two oldest, still-existing football teams from Sofia. Both teams won the Bulgarian Republican Championship several times prior to the Second World War. Slavia managed to win six national titles before 1945, while Levski won three national titles, and one Bulgarian Cup.

The two teams are also among the most successful when it comes to the Bulgarian Cup. Levski has won a record 26, while Slavia has won 8. They have also played against each other twice in the finals of the competition. The first final between them occurred in 1996. The match did not even finish, with Slavia being awarded a walkover in their favor, due to Levski deciding to abandon the game in the 75th minute. 22 years later, the two sides again met in the final, in 2018. The game ended in a goalless draw, after which Slavia won on penalties, thus winning their eight title overall. In 2021, the two rivals met again in the quarter-finals of the tournament, with Slavia winning once again by the score of 2–1. However, Levski is the dominant force in this rivalry, historically.

As of 29 March 2024

Notes:

• Bulgarian Cup section includes Soviet Army Cup as major Cup tournament.
• Soviet Army Cup section includes the period after 1982 as secondary Cup tournament.
• People's Republic of Bulgaria Cup section includes the period before 1982 as secondary Cup tournament.
• Italics indicates defunct tournaments.