The 2011–12 División de Honor was the 45th season of the top flight of the Spanish domestic rugby union competitions since 1953.

Valladolid won the title, while Alcobendas were relegated to División de Honor B.

The season took place between September and March, with every team playing each other home and away for a total of 18 matches.

The club which finished bottom went into a playoff with a team from División de Honor B.

Source: Federación Española de Rugby The relegation playoff was contested over two legs by Alcobendas, who finished 10th in División de Honor, and Hernani, the losing team from División de Honor B promotion playoff final.