The 2018–19 División de Honor was the 52nd season of the top flight of the Spanish domestic rugby union competition since its inception in 1953.

Valladolid won its third consecutive title, its ninth overall, after defeating local arch-rivals SilverStorm El Salvador in the Final.

The División de Honor season takes place between September and March, with every team playing each other home and away for a total of 22 matches.

The relegation playoff was played over two legs by La Vila, the team finishing 11th in División de Honor, and Santander, the losing team from División de Honor B promotion playoff final.

Santander won 57–53 on aggregate and gained promotion to the División de Honor for the 2019–20 season.