A list of units and formations of the Spanish Army in 1990 is given below.

From 1958–60 the Spanish Army reorganized along "Pentomic" five-component division lines. In 1965 a reorganization was undertaken that divided Spanish Army forces into Immediate Intervention (Field Army) and Operational Territorial Defence (Territorial Army) formations, adopting a structure of divisions broken down into brigades. However, from 1984 a modernization plan was underway aimed at improving the deployability of the army and updating its equipment. The Modernización del Ejército de Tierra (META) plan, as it was called, only achieved its objectives partially, yet the army was reorganized.

After the end of the Spanish Civil War, infantry regiments maintained a traditional and ceremonial identity, but were not an operational level of command. Operational command goes from brigades directly to infantry battalions, bypassing the regimental level. Spanish Army armoured units were designated "Armoured Infantry Battalions" and are considered part of the infantry.

Army General Staff Army General Staff, in Madrid Infantry Regiment "Inmemorial del Rey" No. 1, in Madrid

Military Region I Central

The Military Region I Central (Región Militar I Centro) with its headquarters in Madrid encompassed the Community of Madrid (including the Province of Madrid) and the provinces of Ávila, Ciudad Real, Cuenca, Guadalajara, Segovia, and Toledo, all of Castilla–La Mancha as well as the provinces of Badajoz and Cáceres in Extremadura.

Headquarters, in Madrid Special Operations Group "Órdenes Militares" I, in Colmenar Viejo Construction Battalion I, in Madrid Signal Company No. 1, in Madrid

Armored Division "Brunete" No. 1 Division Headquarters, in El Pardo Mechanized Infantry Brigade XI, in Bótoa Mechanized Infantry Regiment "Saboya" No. 6, in Bótoa Mechanized Infantry Battalion "Cantabria" I/6 Mechanized Infantry Battalion "Las Navas" II/6 Mechanized Infantry Regiment "Castilla" No. 16, in Bótoa Mechanized Infantry Battalion "Alcántara" III/16 Armored Infantry Battalion "Mérida" IV/16 Field Artillery Group XI, in Mérida Engineer Battalion XI, in Badajoz Logistic Group XI, in Mérida Armored Brigade XII, in El Goloso Mechanized Infantry Regiment "Asturias" No. 31, in El Goloso Mechanized Infantry Battalion "Covadonga" I/31 Armored Infantry Regiment "Alcázar de Toledo" No. 61, in El Goloso Armored Infantry Battalion "Uad Ras" II/61 Armored Infantry Battalion "León" III/61 Field Artillery Group XII, in El Goloso Engineer Battalion XII, in El Goloso Logistic Group XII, in El Goloso Light Armored Cavalry Regiment "Villaviciosa" No. 14, in Retamares Field Artillery Regiment No. 11, in Fuencarral Field Artillery Group I/11 Field Artillery Group II/11 Engineer Regiment No. 1, in Colmenar Viejo Divisional Logistic Grouping No. 1, in Colmenar Viejo Light Anti-aircraft Artillery Group I, in Vicálvaro

Military Region II South

The Military Region II South (Región Militar II Sur) with its headquarters in Seville covered Andalusia (Provinces of Almería, Cádiz, Córdoba, Granada, Huelva, Jaén, Málaga, and Seville), the exclaves of Ceuta and Melilla, and the Plazas de soberanía.

Headquarters, in Seville Special Operations Group "Santa Fe" II, in Granada Construction Battalion II, in Seville Signal Company No. 2, in Seville

Motorized Infantry Division "Guzmán el Bueno" No. 2 Division Headquarters, in Granada Mechanized Infantry Brigade XXI, in Cerro Muriano Mechanized Infantry Regiment "La Reina" No. 2, in Cerro Muriano Mechanized Infantry Battalion "Princesa" I/2 Mechanized Infantry Battalion "Lepanto" II/2 Mechanized Infantry Regiment "Córdoba" No. 10, in Cerro Muriano Mechanized Infantry Battalion "Almansa" III/10 Armored Infantry Battalion "Málaga" IV/10 Field Artillery Group XXI, in Cerro Muriano Engineer Battalion XXI, in Córdoba Logistic Group XXI, in Cerro Muriano Motorized Infantry Brigade XXII, in Jerez de la Frontera Mixed Infantry Regiment "Soria" No. 9, in Seville Motorized Infantry Battalion "Tarifa" I/9 Armored Infantry Battalion "Argel" II/9 Motorized Infantry Regiment "Pavía" No. 19, in San Roque Motorized Infantry Battalion "Cádiz" III/19 Motorized Infantry Battalion "Álava" IV/19 Field Artillery Group XXII, in Camposoto Engineer Battalion XXII, in Camposoto Logistic Group XXII, in Camposoto Motorized Infantry Brigade XXIII, in Almería Motorized Infantry Regiment "Aragón" No. 17, in Viator Motorized Infantry Battalion "Nápoles" I/17 Motorized Infantry Battalion "Simancas" II/17 Mixed Infantry Regiment "Granada" No. 34, in Viator Motorized Infantry Battalion "Extremadura" III/34 Armored Infantry Battalion "Almería" IV/34 Field Artillery Group XXIII, in Viator Engineer Battalion XXIII, in Viator Logistic Group XXIII, in Viator Light Armored Cavalry Regiment "Sagunto" No. 7, in Seville Field Artillery Regiment No. 14, in Seville Field Artillery Group I/14 Field Artillery Group II/14 Engineer Regiment No. 2, in Seville Divisional Logistic Grouping No. 2, in Granada Light Anti-aircraft Artillery Group II, in Granada

Melilla General Command The Melilla General Command was headed by a two-star general and tasked with the defense of the Spanish exclave of Melilla in Africa.

Command Headquarters, in Melilla Armored Cavalry Regiment "Alcántara" No. 10, in Melilla Tercio "Gran Capitán" No. 1 of the Legion, in Melilla Motorized Infantry Bandera "Casa de Borgoña" I/1 Motorized Infantry Bandera "Carlos V/I" II/1 Motorized Infantry Regiment "Regulares de Melilla" No. 52, in MelillaBattalion-level units of the Regulares are named traditionally as Tabor Motorized Infantry Battalion "Alhucemas" I/52 Motorized Infantry Battalion "Rif" II/52 Field Artillery Regiment No. 32, in Melilla Field Artillery Group I/32 Engineer Regiment No. 8, in Melilla Light Anti-aircraft Artillery Group VII, in Melilla

Ceuta General Command The Ceuta General Command was headed by a two-star general and tasked with the defense of the Spanish exclave of Ceuta in Africa.

Command Headquarters, in Ceuta Armored Cavalry Regiment "Montesa" No. 3, in Ceuta Tercio "Duque de Alba" No. 2 of the Legion, in Ceuta Motorized Infantry Bandera "Cristo de Lepanto" IV/2 Motorized Infantry Bandera "Gonzalo Fernández de Córdoba" V/2 Motorized Infantry Regiment "Regulares de Ceuta" No. 54, in Ceuta Motorized Infantry Battalion "Tetuan" I/54 Motorized Infantry Battalion "Larache" II/54 Mixed Artillery Regiment No. 30, in Ceuta Field Artillery Group I/30 Coastal Artillery Group II/30 Engineer Regiment No. 7, in Ceuta Light Anti-aircraft Artillery Group VI, in Ceuta

Military Region III Levant

The Military Region III Levant with its headquarters in Valencia encompassed the province of Albacete of Castilla-La Mancha, and the Valencian Community (composed of the provinces of Alicante, Castellón, and Valencia), as well as the Region of Murcia and the Balearic Islands.

Headquarters, in Valencia Special Operations Group "Valencia" III, in Rabasa Construction Battalion III, in Valencia Signal Company No. 3, in Valencia

Mechanized Infantry Division "Maestrazgo" No. 3 Division Headquarters, in Valencia Mechanized Infantry Brigade XXXI, in Castellón de la Plana Mechanized Infantry Regiment "Tetuán" No. 14, in Castellón de la Plana Mechanized Infantry Battalion "Tarragona" I/14 Mechanized Infantry Battalion "Guadalajara" II/14 Mechanized Infantry Regiment "Vizcaya" No. 21, in Bétera Mechanized Infantry Battalion "Barbastro" III/21 Armored Infantry Battalion "Otumba" IV/21 Field Artillery Group XXXI, in Paterna Engineer Battalion XXXI, in Bétera Logistic Group XXXI, in Bétera Mechanized Infantry Brigade XXXII, in Cartagena Mechanized Infantry Regiment "Mallorca" No. 13, in Lorca Mechanized Infantry Battalion "Murcia" I/13 Mechanized Infantry Battalion "San Fernando" II/13 Mechanized Infantry Regiment "España" No. 18, in Cartagena Mechanized Infantry Battalion "Sevilla" III/18 Armored Infantry Battalion "Bailén" IV/18 Field Artillery Group XXXII, in Murcia Engineer Battalion XXXII, in Cartagena Logistic Group XXXII, in Cartagena Light Armored Cavalry Regiment "Lusitania" No. 8, in Marines Field Artillery Regiment No. 17, in Paterna Field Artillery Group I/17 Field Artillery Group II/17 Engineer Regiment No. 3, in Marines Divisional Logistic Grouping No. 3, in Marines Light Anti-aircraft Artillery Group III, in Paterna

Balearic Military Zone The Balearic Military Zone was headed by a two-star general and encompassed the Balearic Islands. Its three troop commands were headed by one-star generals.

Headquarters, in Palma de Mallorca Palma Troops Command, in Palma de Mallorca Motorized Infantry Regiment "Palma" No. 47, in Palma de Mallorca Motorized Infantry Battalion "Filipinas" I/47 Mixed Artillery Regiment No. 91, in Palma de Mallorca Field Artillery Group I/91 Light Anti-aircraft Artillery Group II/91 Coastal Artillery Group III/91 Engineer Battalion XIV, in Palma de Mallorca Mahón Troops Command, in Mahón Motorized Infantry Battalion "Mahón", in Mahón Field Artillery Group V, in Es Mercadal Ibiza Troops Command, in Ibiza Motorized Infantry Battalion "Teruel", in Ibiza Coastal Artillery Group VI, in San Carlos Field Artillery Group VII, in Ibiza

Military Region IV Eastern Pyrenees

The Military Region IV Eastern Pyrenees (Región Militar IV Pirenaica Oriental) with its headquarters in Barcelona covered Aragon (Provinces of Huesca, Teruel, and Zaragoza) and Catalonia (Provinces of Barcelona, Girona, Lleida, and Tarragona).

Headquarters, in Barcelona Special Operations Group "Almogávares" IV, in Barcelona Construction Battalion IV, in Barcelona Signal Company No. 4, in Barcelona

Mountain Infantry Division "Urgel" No. 4 Division Headquarters, in Lleida Mountain Hunters Brigade XLI, in Lleida Mountain Hunters Regiment "Arapiles" No. 62, in La Seu d'Urgell Mountain Hunters Battalion "Alba de Tormes" I/62 Mountain Hunters Battalion "Cataluña" II/62 Mountain Hunters Regiment "Barcelona" No. 63, in Lleida Mountain Hunters Battalion "Chiclana" III/63 Mountain Hunters Battalion "Badajoz" IV/63 Mountain Field Artillery Group XLI, in San Clemente Engineer Battalion XLI, in San Clemente Logistic Group XLI, in San Clemente Skiers Company No. 41, in Vielha High Mountain Hunters Brigade XLII, in Jaca High Mountain Hunters Regiment "Galicia" No. 64, in Jaca High Mountain Hunters Battalion "Pirineos" I/64 High Mountain Hunters Battalion "Gravelinas" II/64 High Mountain Hunters Regiment "Valladolid" No. 65, in Huesca High Mountain Hunters Battalion "Gerona" III/65 Field Artillery Group XLII, in Huesca Engineer Battalion XLII, in Huesca Logistic Group XLII, in Huesca Field Artillery Regiment No. 21, in Lleida Field Artillery Group I/21 Field Artillery Group II/21 Engineer Regiment No. 4, in Lleida Divisional Logistic Grouping No. 4, in Lleida

Cavalry Brigade "Castillejos" II Brigade Headquarters, in Zaragoza Armored Cavalry Regiment "Pavía" No. 4, in Aranjuez Light Armored Cavalry Regiment "Numancia" No. 9, in Zaragoza Light Armored Cavalry Regiment "España" No. 11, in Zaragoza Field Artillery Regiment No. 20, in Zaragoza Engineer Battalion II, in Zaragoza Logistic Group II, in Zaragoza

Military Region V Western Pyrenees

The Military Region V Western Pyrenees (Región Militar V Pirenaica Occidental) with its headquarters in Burgos encompassed the provinces of the Basque Country (Álava, Biscay, Burgos and Gipuzkoa), the province of Soria in Castile and León and the regions of Cantabria, La Rioja and Navarre .

Headquarters, in Burgos Special Operations Group "San Marcial" V, in Castrillo del Val Construction Battalion V, in Castrillo del Val Signal Company No. 5, in Castrillo del Val

Mountain Division "Navarra" No. 5 Division Headquarters, in Pamplona