Advanced Wargames Rules
Advanced wargaming rules for generals who want actual games rather than the luck of the dice games I see so so often. 
Aegir's Fire
Viking campaigning rules - usable with any set of skirmish rules and any scale, this set contains strategic rules for raiding, developing your viking crew and some exploring. Ideal for someone with lots of different figures from the period.
Age of Blood 2nd Edition
The idea behind the rules is to allow you to play good sized skirmish games using 28mm scale miniatures from the likes of Gripping Beast and Foundry.
Alexius
A quick and easy campaign game for the Crusades period in the Byzantine Empire, including map, counters, and miniatures interface for the Ironbow rules.
Away With Honour
Wargames Rules for Naval Warfare in the Middle Ages.
Axemen and Allies
A Medieval miniatures variant of Axis and Allies.
Bad Endings
A simple set of Medieval Skirmish rules, not for the feint hearted by Craig Cartmell.
Battle of Agincourt (1415 AD)
Fast play rules for the famous battle.
Battle of Hastings
Rules for the Battle of Hastings.
Battle of Hastings(2)
Fast Play Rules for the famous battle.
Battle of Hattin (1187 AD)
The Crusader army was dying of thirst when they approached Lake Tiberias only to find Saladin's army blocking their path.
Battle of Liegnitz (1241 AD)
In 1241 the mighty Mongol army launched an invasion into Europe.
Battles of the Barons
This simulation is about feudal Europe from 700 AD - 1200 AD, the late Middle Ages. The simulation is not set in any specific part of Europe, and the term "baron" is used to refer to nobles.
Chevauchee
An easy-to-learn tabletop game designed for play with medieval miniatures and inspired by the popular Skirmish system.
Crusader
Crusader is designed to represent small-scale actions during the 11th to 13th Century. It is intended to be simple and fun - any relationship to historical reality is purely co-incidental.
Crusader Lite
Lite version of the new Crusader Minis rules suitable for Saxons and Normans.
Danegeld and Dragonships
Dark Age Skirmish Rules Playtest Version.
Dark Age Infantry Slog
Andy Callans demo rules for the medieval period originally published in Miniature Wargames, No. 7, 1983.
Dark Age Rules
Simple Dark Age Rules (They are in fact a scan of the original rules - but in poor quality).
Dark Ages
This was published a while back in Practical Wargamer, however, it has been improved and speeded up since then. It is suitable for Medieval skirmishes, too.
Fast and Furious
Is a set of 1:1 simple, fast and fun rules for ancient and medieval skirmish scale games using 25-28mm or 1/72 plastic figures, and designed to cover roughly from 3000 BC to 1400 AD.
Feudal Warfare
1:5 scale Feudal-era rules for 25mm size figures. It is taken to be roughly A.D. 750-1250.
Field Of Honour
This is a simple two player card game that is an abstract depiction of two ancient armies facing each other on the battlefield. It can either be played as a simple two player card game, or as a sub-game to a more complex wargame.
Free Company
Being rules for small actions of the Hundred Years War and other fights of the longbow era.
From Macbeth to Medici
These rules cover the period which saw the rise and fall of the mounted knight as the primary combat arm, and as such are all about charging about the place in a disorganised manner, haranguing your allies and subordinates.
God's Acre
This edition of God's Acre was published in the United States by Heritage Models Publishing Division in 1977. It's not entirely as published.
Guts
Dark Ages and Fantasy Combat System Craig Cartmell.
Heimskringla
Viking Naval Warfare in the Age of the Sagas.
Hex Command
Boardgame ease and the beauty of miniatures, but keeping the flavour of historical command. Medieval rules.
Into The Dark
Using old fashioned game mechanics to create a Medieval mass combat game system that's fast, simple and easy to play.
Into the Glory
A set of wargame rules from that cover the period 1500AD to 1900AD.
IronBow
Miniatures rules for the Crusades era. The ebb and flow will determine the victor. (Requires Princes of the East).
Japanese Art of War
The Japanese Art of War use the Universal Skrimish System. The rules are suitable for individually mounted figures and can handle approximately 30 figures per experienced player or 10 for newbies.
Joust
Simple Jousting game for knights.
Knights and Knaves
A skirmish level game of combat in the Middle Ages. Extra scenarios and rules for naval, sieges and campaigns are also available.
Knights v Knights
Simple rules that use simplified combat using a a coin.
Lord Merlin's Rules of Engagement
These skirmish rules are designed around the use of large (c. 70mm or 1:20) scale figures. Smaller figures will work, of course, you just have to adjust some measurements accordingly.
Lords and Levies
Fastplay medieval card driven rules, 4th in our series!
Lords and Levies: Siege Rules
Siege rule expansion for Lords and Levies.
Mayhem: Warrior Kings
Man to man combat in ancient and medieval times from Two Hour Wargames.
Medieval Battle Rules
Brian Cameron's Medieval Battle Rules for 25mm figures.
Medieval Castle Siege
Rules to recreate a castle siege.
Medieval Clash of Armies
These rules are based on Fast Play Rules for Students (Medieval History) by Matt Fritz.
Medieval Naval Warfare - "Away with Honour"
Inspired by a figure range, this time the lovely medieval ships from Outpost Wargames Services.
Medieval Period Rule Set
Fast play rules.
Medieval Siege
Medieval Siege is played with two or more teams.
Medieval Skirmish Rules
One figure = one man one inch = 10ft one move = about 30 seconds.
Medieval Warlords
These are rules for a large-scale play-by-email campaign, for up to 23 separate realms. There is a map provided for the historical time period circa 1320 AD.
Men At Arms
One brain cell medieval skirmish rules for 25mm figures.
Metalsmashing
Quick and simple rules for the Ancients and Medieval period.
Mindstalkers: Mission Middle Ages
A 3D skirmish wargame usig 3 to 4 figures each. From the homepage you can also download factions or "Vexillia".
Minimal Melee Combat
Minimal Melee Combat is a simple game designed to create a feeling for combat between to combatants armed with swords. It is not designed to be an accurate simulation and make no attempts at this.
Monjoie
Monjoie! is a set of skirmish rules designed to provide an entertaining wargame based on the Song of Roland. The rules are intended for use with individually based 25mm/28mm figures with players controlling one or two heroes and their retinues.
MudGrunt
Medieval modification of Ground Zero Games' StarGrunt II rules, written by Jon Tuffley. They require you to own the StarGrunt II rules.
My Kingdom for A Horse
Each player controls one or more retinues. Each Retinue consists of a Lord, and a group of men sworn to defend him.
Pigs and Glory:The Viking Sagas
A set of rules to create interaction between families of Vikings and to give a purpose to all the mindless slaughter.
Princes of the East
A political/military game of the period immediately after the first crusade. Each nation strives for supremacy. Only the strongest, most cunning, will leave a legacy of stabilty and survival for his people.
Rebellion
28mm Skirmish rules for the Scottish War of Independence led by William Wallace in 1297. Now expanded with cavalry, archers, pikes and heroes.
Rules By Ral
A modified version of the rules that Ral Partha used to hand out at conventions and which were on their web site till recently. All units are 12-man infantry or 6-man cavalry units.
Saxon Dogs
The author finished reading Bernard Cornwell's Arthur trilogy, and discovered Gripping Beast's fantastic 28mm range of Dark Age figures and obviously there was no way that he could resist.
Shields and Blades
This rule set is a squad-level scale using side move / countermove system. The rule set has opportunity fire (with both standing and moving fire). Since these rules are not skirmish level, the shield facing and facing of the castings is not a problem.
Siege of Kenilworth Castle (1266)
The simulation is a matrix game, and for the most part follows the standard matrix game rules.
Simple 100 years War Rules
Eric Woods' one-page (front and back) rules for Medieval games. From a former Jackson Gamer.
Simplus Minituris Rules
Simple Medieval rules.
Skirmish
A cardgame of dark ages combat in similar style to Lunch Money by Atlas Games.
Skjaldborg
A largescale skirmish set for Ancient and Medieval wargames. Can also be used to fight bigger battles.
Strategike Antiquity medieval periode
A DBA like rules. Quickly and easy to make his army. In French.
The Battle Of Calenzano
Battle from the Medieval Period.
The Rules According to Ral
These rules were originally published as by Ral Partha.The medieval battles described in these rules are fought between armed groups of men led by valiant leaders represented by miniature figures.
Tourney
Knights of old prepare to match your skills of battle on the Tourney. Defeat your opponent in the Joust, win the Lady's favour, and triumph in the Grand Melee. Only then will you be worthy of the title 'Knight'. Lots of extras on the Homepage.
War of the Roses
25mm Skirmish wargaming a touch of influence from Retinue, the best of the commercial Wars Of The Roses rules.
Warcometh
Medieval & Fantasy Warfare, 1000 AD to 1490 AD. A fun and non fiddly ruleset.
Werod
A set of warband level rules for the Dark Ages. It covers the Age of Arthur through to the Norman Conquest and allows you to use the tactics of the period, shieldwalls and svinfylking. The current version is available for playtesting.
You'll Have Someone's Eye Out With That
This is a set of skirmish rules for Ancient-Renaissance.