This is a chronologically ordered list of monarchs of Spain, including the medieval kingdoms of Asturias, Leon, Castile, Galicia, and Aragon.

Asturias (including Galicia from 739 and Leon from 855)

• Pelayo (c. 718–c. 737)
• Favila (c. 737–739)
• Alfonso I (739–757)
• Fruela I (757–768)
• Aurelio (768–774)
• Silo (774–783)
• Mauregato (783–788)
• Bermudo I (788–791)
• Alfonso II (791–842)
• Ramiro I (842–850)
• Ordoño I (850–866)
• Alfonso III (866–910)

• Fruela II (Asturias, 910–925)
• García I (Leon, 910–914)
• Ordoño II (Leon, 914–924)
• Ordoño II (Galicia, 910–924)

Leon (including Asturias and Galicia)

• Fruela II (924–925)
• Alfonso IV (c. 925–c. 931)
• Ramiro II (c. 931–950)
• Ordoño III (950–955)
• Sancho I (first time; 955–958)
• Ordoño IV (958–960)
• Sancho I (second time; 960–966)
• Ramiro III (967–982)
• Bermudo II (982–999)
• Alfonso V (999–1028)
• Bermudo III (1028–37)

Leon and Castile

• Ferdinand I (Fernando) (1039–65)

• Alfonso VI (Leon, 1065–72)
• Sancho II (Castile, 1065–72)
• Garcia II (Galicia, 1065–71)

Leon and Castile (including Galicia)

• Sancho II (1072)
• Alfonso VI (1072–1109, restored)
• Urraca (1109–26, ruled with husband, Alfonso I of Aragon)
• Alfonso VII (1126–57)

• Ferdinand II (Fernando) (1157–88)
• Alfonso IX (1188–1230)

• Sancho III (1157–58)
• Alfonso VIII (1158–1214)
• Henry I (Enrique) (1214–17)
• Ferdinand III (1217–52)

Castile (including Leon)

• Alfonso X (1252–84)
• Sancho IV (1284–96)
• Ferdinand IV (Fernando) (1296–1312)
• Alfonso XI (1312–50)
• Peter I (Pedro) (first time; 1350–66)
• Henry II (Enrique) (1366–67)
• Peter I (second time; 1367–69)
• Henry II (second time; 1369–79)
• John I (Juan) (1379–90)
• Henry III (Enrique) (1390–1406)
• John II (Juan) (1406–54)
• Henry IV (Enrique) (1454–74)
• Isabella I and Ferdinand V (Ferdinand II of Aragon) (first time; 1474–1504)
• Joan and Philip I (Juana and Felipe) (1504–06)
• Ferdinand V (second time; 1506–16)

Aragon

• Ramiro I (1035–63)
• Sancho I (1063–94)
• Peter I (Pedro) (1094–1104)
• Alfonso I (1104–34)
• Ramiro II (1134–37)
• Petronilla (ruled with husband, Ramón Berenguer IV of Barcelona) (1137–63)
• Alfonso II (1163–96)
• Peter II (Pedro) (1196–1213)
• James I (Jaime) (1213–76)
• Peter III (Pedro) (1276–85)
• Alfonso III (1285–91)
• James II (Jaime) (1291–1327)
• Alfonso IV (1327–36)
• Peter IV (Pedro) (1336–87)
• John I (Juan) (1387–95)
• Martin (1395–1412)
• Ferdinand I (Fernando) (1412–16)
• Alfonso V (1416–58)
• John II (Juan) (1458–79)
• Ferdinand II and Isabella I (1479–1504); as Fernando and Isabel (1479–1516)

Spain

• Charles V (Carlos) (1516–56)
• Philip II (Felipe) (1556–98)
• Philip III (Felipe) (1598–1621)
• Philip IV (Felipe) (1621–65)
• Charles II (Carlos) (1665–1700)

• Philip V (Felipe) (first time; 1700–24)
• Louis (Luis) (1724)
• Philip V (second time; 1724–46)
• Ferdinand VI (Fernando) (1746–59)
• Charles III (Carlos) (1759–88)
• Charles IV (Carlos) (1788–1808)
• Ferdinand VII (Fernando) (first time; 1808)

• Joseph (José) (1808–13)

• Ferdinand VII (second time; 1814–33)
• Isabella II (Isabel) (1833–68)

• interregnum (1868–70)

• Amadeus (Amadeo) (1870–73)

• Republic of 1873 (1873–74)

• Alfonso XII (1874–85)
• Alfonso XIII (1886–1931)
• Republic (1931–39)
• Nationalist regime (Francisco Franco) (1939–75)
• Juan Carlos (1975–2014)
• Felipe VI (2014– )