- The Diplomatic Corps
- A group of players and hobby organizations. Includes tournament information and coordinates gameplay.
- Avalon Hill's Diplomacy Page - AH holds the copyrights of the game. FAQ, game rules and Diplomacy message board.
- Diplomacy A - Z - The hobby encyclopedia.
- Diplomacy Archive - An archive for materials relating to the boardgame Diplomacy.
- Diplomacy at BoardGameGeek - Description, sessions, second hand sale, articles and links.
- Diplomacy Boardgame Compendium and Gallery - Includes information about different versions of the game, other games based on Diplomacy, books, and software.
- Diplomacy Search Engine - Searches Diplomacy-related sites.
- Diplomacy Tutorial - Detailed tutorial for beginners. Covers the basics of Diplomacy.
- Diplomacy World - One of the oldest and most respected fanzines of the hobby.
- Diplomatic Core - Contains the Master Diplomacy Database, source for the Diplomatic Pouch Tournament Ratings. Maintained by Matt Shields.
- Diplomiscellany - Diplomacy related material, including model house rules for non-judge e-mail games, the Maharajah's Diplomacy, and articles on gaming philosophy.
- Jay Furr's Diplomacy House Rules - House rules for playing e-mail games via the Judge servers found on the Internet.
- Judge Diplomacy Player Ratings - A rating system derived from the ELO ratings used by the Chess community and based upon a database of games played on the Judges since 1988.
- Postal Diplomacy in the UK - Records the rise and fall of the postal hobby in the UK. History, current and old zines.
- Psychopath - A webzine for playing Diplomacy, Diplomacy variants and other games. Includes chat, letters and articles.
- The Diplomacy Ring - Web ring for web sites related to Diplomacy.
- The Diplomatic Pouch - Once the flagship of the online hobby. Still contains fanzine, information and e-mail games.
- The Newbies' Guide to the Judge - The Newbies' Guide to the Judge, an automated Internet-based Diplomacy adjudicator.
- Wikipedia Article - The internet encyclopedia's entry on Diplomacy.