In the classic BattleTech board game, as well as in most other games set in the BattleTech universe, the main gameplay takes place on a mapsheet with hexagonal playing fields. Typically, two mapsheets would be included with every boxed set. Sets with other playing maps were later produced as game supplementals.
 MapsheetBattleDroids edition through to the latest editions, though there have been cosmetic changes. The printed size of a standard mapsheet is 22 inches by 18 inches (not 22 by 17 as many rulebooks suggest).
This basic mapsheet, two of which are included in each boxed set, is a standardized size and has an addressing scheme printed on the map in a staggered row and column format. There are fifteen columns, 01XX through 15XX, and there are nominally 17 rows, XX01 through XX17. Additionally there is an unaddressed half hex column on the sides of the mapsheet that make up a "sixteenth column" when multiple mapsheets are tiled. On a standard mapsheet the hex size as originally printed is approximately 1.25 inches and depicts terrain ca. 100 foot (roughly 30 meters) across. As published, BattleTech mapsheets have terrain, including vegetation, hydrologic features and topography marked. The flipside was a blank hex board in earlier editions; such blank playing fields are not considered tournament-legal maps though.
Under standard rules the mapsheet is also referred to as a unit of distance with the range of artillery pieces being originally expressed in terms of the number of mapsheets (or "boards") a given unit could fire. On the AeroTech low altitude map each hex is stated to correspond with a a mapsheet at the ground level. Total Warfare provides rules how maps may (or may not) be placed to form bigger playing fields, and provides that in the absence of actual mapsheets (e.g. when playing on other hex terrain), one "board" translates as 17 hexes for determining range.
Other board games in the BattleTech universe have generally used mapsheets that are printed to the same size hex size as the original mapsheet, even though other games have represented different distances per hex: The mapsheets included with BattleForce originally represented 180m per hex compared to the 30m per hex of standard BattleTech. The BattleForce mapsheet is a double size mapsheet, being exactly twice the width, in hexes, of the standard BattleTech mapsheet, with columns from 01XX to 32XX. Similarly, the mapsheets in the Solaris VII game represent only 7.5m of ground distance, a quarter of the scale of standard BattleTech. Nonetheless, as the hexes are printed to the same size on paper and use the same map symbology the maps can be used interchangeably between these various BattleTech scales. BattleTroops was one notable departure from this printing convention, instead using a layout of points in a triangular pattern rather than a hex-grid. The original AeroTech was another departure, being printed on a half inch hex-grid rather than the one and a quarter inch grid in BattleTech for both an outer space map and a low altitude map.
Up until 1988 (i.e. up until the first edition of Map Set 2) the maps were printed on thick cardboard similar to the maps included with the BattleTech 2nd Edition and CityTech boxed sets.
Starting with the second edition of Map Set 2 (1991) and the BattleTech, Third Edition (1992) boxed set, maps were printed on thinner paper. This allowed maps to be included in some sourcebooks, too (see Other maps below).
From 2002 until 2008 the various game supplementals, including map sets, were produced under the "Classic BattleTech" moniker to differentiate them from supplements for the "MechWarrior: Dark Age" brand. Afterwards, the line reverted back to just "BattleTech".
 Map Sets
A number of Map Sets and Map Set Compilations were published as supplements for the board game since, providing additional gaming maps with new hex-based terrain. In Germany, Map Sets 2 through 5 (with translated map markings) were sold as GeoTech I through IV by FanPro.
 Map Set
A first, unnumbered GeoTech set is said to have been published in 1990 containing a (German) BattleTech rulebook and the River Valley, Desert Hills and Industrial maps, i.e. roughly equivalent to Map Set 1.Maps included:
 Map Set 2
German edition published in 1993 as "GeoTech I".Maps included:
 Map Set 3
German edition published in 1993 as "GeoTech II".Maps included:
 Map Set 4
German edition published in 1993 as "GeoTech III".Maps included:
 Map Set 5
German edition published in 1997 as "GeoTech IV".Maps included:
Large Mountain #1
 Map Set 6
 Map Set 7
 Map Set Compilation 1
 Map Set Compilation 2BattleForce 2 and the BattleSpace map.
Planetary Assault Map 1
Planetary Assault Map 2
 Map Pack: Flatlands Terrain Set
 Map Pack: Solaris VII
- (see Mappack: Solaris VII for full article)
Besides being a compilation of previously published maps for various Solaris Games Duelling Arenas, for play under either Solaris-style 'Mech Duel Rules or classic BattleTech (board game) rules, the pack includes a sourcebook section detailing the gaming world and some of its stables. Special rules provided for playing on certain maps.Maps included:
King of the Mountain
The Mud Pit
 Hex Packs
The first Hex Pack was released in 2010 and heralded a new style for maps, which were now printed on thick, double-sided gameboard-style cardboard with vinyl covering, with different maps printed on the two sides. In addition, punchout map pieces of various sizes are included to modify the maps as well as a booklet with scenarios and rules expansions for the basic game from Tactical Operations. (The BattleTech 25th Anniversary Introductory Box Set may have been intended to be the first product featuring these improved maps, but its release was delayed until 2011 by other issues.)
 Hex Pack: Lakes and Rivers
- (see HexPack: Lakes and Rivers for full article)
Maps included: River Valley, Large Lakes #2 (flip-sided).
 Hex Pack: Cities and Roads
- (see HexPack: Cities and Roads for full article)
Maps included: City (Skyscraper), City (Hills/Residential) #1 (flip-sided).
 Hex Pack: Mountains and Canyons
- (see HexPack: Mountains and Canyons for full article)
Maps included: Large Mountain #1, Deep Canyon #1 (flip-sided).
 Other maps
Beyond the boxed sets and dedicated map packs, some individual products included mapsheets:
 BattlePack: Fourth Succession War
The "Woodland" map was first published with BattlePack: Fourth Succession War in 1998 before it was included in Map Set #6 two years later.
 Luthien scenario pack
The Luthien (scenario pack) from 1993 included a loose double-sided map. One side depicted part of Imperial City, the other Kado-guchi Valley. The latter was the site of a large battle and is meant for playing on a different scale akin to BattleForce.
 Renegade Legion
FASA had another successful hex-based wargame, Renegade Legion, that used similar maps to BattleTech to the point where the first map sets were advertised as supplementals for both game lines simultaneously, in the fashion of a shared product. Conversely, some Renegade Legion products contain mapsheets that were never officially published for BattleTech, but can be used for BattleTech nonetheless.
 Casus Belli magazine
The French gaming magazine Casus Belli, who had ties to the offical publisher of the French edition of BattleTech (Jeux Descartes), published a BattleTech map in 1994 that is copyrighted to the magazine, but matches the style found in other BattleTech maps. The map is marked "©Casus Belli 1994 Carte concue par Michal Salicetto, dessin Bernard Bittler BATTLETECH est un jeu édité par Jeux Descartes sous licence FASA". Since this product was not published directly by a BattleTech IP owner or licensee, its status as an official product is arguable.