Over the decades, a number of supplements have been published for BattleTech, a wargaming and military science fiction franchise^[1] launched by FASA Corporation in 1984, acquired by WizKids in 2001, which was in turn acquired by Topps in 2003;^[2] and published since 2007 by Catalyst Game Labs. The trademark is currently owned by Topps and, for video games, Microsoft Gaming; Catalyst Game Studios licenses the franchise from Topps.

BattleTech: Map Set 1 is a pack of four maps on cardstock which contained maps identified as: "Open Terrain", "River Valley", "Lake Area" and "City/Industrial Complex". It was published by FASA in 1985.^[3]

Stephan Wieck reviewed BattleTech Map Set in White Wolf #7 (1987), rating it a 9 out of 10 and stated that "Wonderful to have."^[4]

Tales of the Black Widow Company was published by FASA in 1985 as a 48-page book. It described the mercenary company known as The Black Widow Company of the mercenary unit Wolf's Dragoons.^[5] Tales of the Black Widow Company details the history, organization, individual mechwarriors and BattleMechs of Natasha Kerensky and her mercenary unit; it also includes 12 short scenarios.^[6]: 296 It was written by Jordan Weisman, L. Ross Babcock III, Patrick Larkin, Richard Meyer, J. Andrew Keith, and William H. Keith, Jr., with a cover by Jim Holloway.^[6]: 296

Shannon Appelcline stated that FASA was "looking into how to market Battletech more like an RPG, with more constant releases than a normal wargame could support" and that "This new strategy started off with saddle-stitched books of wargaming scenarios such as Tales of the Black Widow's Company (1985) and The Fox's Teeth (1985)."^[7]: 69

Stephan Wieck reviewed Tales of the Black Widow Company in White Wolf #7 (1987), rating it a 7 out of 10 and stated that "Useless if you prefer to play your own unit instead of playing the Widow's company. Good background for posible opponents to players. Excellent if you only own Battletech."^[8]

The Fourth Succession War Military Atlas Volume 1 was published by FASA in 1988. It was designed by Sam Lewis, James Long, Michael Lee, Blaine Pardoe and Boy Petersen, with illustrations by Roger Loveless and John Marcus, and cover art by Jim Holloway.^[6]: 293 FASA published Volume 2 of this set the following year.

It details the Fourth War of Succession,^[9] which began in August 3028 after the Prince of the Federated Suns, Hanse Davion, gave his newlywed wife Melissa Steiner of the Lyran Commonwealth the Capellan Confederation as a wedding gift.^[10]

In Issue 6 of the British game magazine Games International, Jake Thornton expressed disappointment in this product, saying, "Sadly the whole book smacks of being written to a rather unimaginative formula. Unless you really don't have the time, or you simply must have everything FASA produce, I wouldn't recommend you buy it." Thornton concluded by giving this book a very poor rating of only 1 out of 5 for role-playing gamers, and 3 out of 5 for wargamers.^[9]

In Issue 51 of the French games magazine Casus Belli, Pierre Lejoyeux noted that "Each battle is presented and analyzed with many color shots and with the same rigor and seriousness that would be appropriate for a 'professional' on the Second World War."^[10]

BattleTech Compendium, published in 1990, is a 144-page softcover book written by the FASA staff, with artwork by Earl Geier, James Nelson, and Mike Nielsen.^[6]: 293 It contains the main armored combat resolution rules from BattleTech, CityTech, and AeroTech, and focusing on battlemechs, as well as armored vehicles and aerospace fighters. The book uses battlemech and vehicle game statistics from BattleTech Technical Readout 2750 and 3050 and Dropships and Jumpships, as well as new designs, and it takes the place of the previously published BattleTech Manual.^[6]: 296 In 1991, it won the Origins Award for Best Miniatures Rules of 1990.^[11]

• GamesMaster International, Issue 7 (Feb. 1991, p.29)
• GamesMaster International, Issue 9 (April 1991, p.71)
• Future Wars, Issue 20 (p. 8)
• Armadillo Droppings, Issue 30 (Summer/Fall 1994, p. 17)
• White Wolf Inphobia #52 (February 1995, p.80)
• Dragon #216^[12]
• Science Fiction Age^[13]
• Australian Realms #20^[14]

BattleTech: Hot Spots was published in 1993 by FASA. It presents 64 missions in a two-volume set.^[15]

Robert DeVoe reviewed BattleTech: Hot Spots in White Wolf #46 (Aug., 1994), rating it a 4 out of 5 and stated that "you get outlines for 64 missions and several new tools, making your job a little easier. I recommend this set for any BattleTech campaign."^[15]

• Australian Realms #16^[16]

BattleTech Tactical Handbook was published by FASA in 1994. It is an 80-page softcover book written by Jim Long and Stuart Johnson containing advanced rules and additional equipment.^[17]

The first part of the book offers a "double-blind" option for combat, where the two combatants maneuver their units on separate maps, and a neutral referee tells each player what is seen; and a strategic operational campaign that links a series of scenarios together. The second part of the book provides advanced rules for ballistic weapons, four-legged mecha and line of sight.

In the November 1994 edition of Dragon (Issue #211), Rick Swan warned players that these rules added complexities to an already complex game, concluding, "All this is strictly for wargamers — make that serious wargamers. Role-players can put their wallets away."^[18]

The Periphery is a 1995 role-playing game supplement for BattleTech and MechWarrior published by FASA. It details the Periphery worlds at the end of the Inner Sphere, with one section for each of the five largest powers on the periphery.^[19]

James Swallow reviewed The Periphery for Arcane magazine, rating it an 8 out of 10 overall.^[19] Swallow comments that "The Periphery is a sourcebook for the referee who wants to get on with it alone, and the rich setting is perfect for a Frontier, Mercenary or Pirate campaign. There's ample room for budding warlords to carve out their own republics through force of arms, engage in politics or just pound the lubricant out of each other's mechs. Definitely worth a look by any BattleTech gamers seeking fresh pastures."^[19]

Technical Readout: 3058 was published by FASA in 1995; It details conventional combat forces, updated versions of previously presented vehicles, and new Inner Sphere BattleMechs.^[20]

Alex Bund reviewed it for Arcane magazine, rating it a 7 out of 10 overall.^[20] Bund comments that "Like previous Technical Readouts, the 3058 edition is an essential sourcebook for both players and referees of Battle Tech or Mechwarrior."^[20]

BattleTech Tech Readout 3058 won in a tie for the Origins Awards for Best Game Accessory of 1995.^[21]

BattleTech Record Sheets were published by FASA in 1996. They are a series of record sheets for mecha and military vehicles. BattleTech Record Sheets 3025 & 3026 has 224 pages containing more than 200 records compiled from BattleTech Technical Readout: 3025 and BattleTech Technical Readout: 3026, and BattleTech Record Sheets 3055 & 3058 has 256 pages with 250 sheets compiled from BattleTech Technical Readout: 3055 and BattleTech Technical Readout: 3058. All sheets are perforated along the spine and hole-punched to be torn out and used with five-ring binders.^[22]

In the May 1996 edition of Arcane (Issue 6), Jim Swallow was ambivalent about the record sheets, pointing out that "The cover art is nice, but these are nothing to get excited about - they're books of record sheets. You can get exactly the same thing in a few minutes with the basic rules, a pencil and a copy of the relevant BattleTech Technical Readout." Swallow gave the sheets a below average rating of 4 out of 10.^[22]

In the June 1996 edition of Dragon (Issue 230), Rick Swan thought that because the sheets covered so many different vehicles, "this may be the best value in the history of the hobby!"^[23]

• Envoyer #19^[24]
• Australian Realms #28^[25]

The Fall of Terra was published by FASA in 1996. It is a soft-cover book by Chris Hartford and Bryan Nystul, with artwork by Tom Baxa, John Bridegroom, Storn Cook, Kevin Long, James Nelson, Mike Nielsen, and Christopher Trevas, and cover art by Doug Chaffee. The book contains a compilation of sixteen BattleTech adventures that describe the story of the struggle for Earth between enemy groups.^[26] The book also includes special rules for moving on ice, snow and mud. Some of the adventures require rules and data from previously published source books BattleSpace, MechWarrior, and MechWarrior Companion.^[27]

In the August 1997 edition of Dragon (Issue #238), Rick Swan gave a good recommendation for this book, saying, "If you’re a BattleTech veteran happy with the third edition (editions one and two are obsolete), there’s no compelling reason to invest in version four. Instead, I direct your attention The Fall of Terra, a compilation of first-rate scenarios dealing with the control of planet Earth."^[27]

• Arcane #12