The 2004 Speedway Conference League was the third-tier division of British speedway.
Sittingbourne Crusaders returned after a seven-year absence but only competed in the Knockout Cup.
The title was won by Mildenhall Fen Tigers.
The 2004 Conference League Knockout Cup was the seventh edition of the Knockout Cup for tier three teams. Mildenhall Fen Tigers were the winners for the second successive year.
First round
Quarter-finals
Semi-finals
James Wright won the Riders' Championship. The final was held on 28 August at Rye House Stadium.
The Pairs Championship was held at the Wimbledon Stadium, on 2 June. The event was won by Mark Burrows and Barrie Evans of the Wimbledon.
Final
Mildenhall won the Conference League Four-Team Championship, held on 10 July 2004 at Loomer Road Stadium.
List of United Kingdom Speedway League Champions