Abstract The decade from 1978 to 1988 was prolific in Mexico in the discovery of giant oil fields. Some of these fields can be considered supergiants according to Michel T. Halbouty's classification, including Agave, Giraldas, Paredon, Abkatun, Ek, Ku, Maloob, and Pol. This paper reports on 21 of these giant oil fields discovered in Mexico during the 1978-88 decade. Eleven of these fields are in the Chiapas-Tabasco area (Agave, Bellota, Cardenas, Giraldas, Iris, Jujo, Luna, Muspac, Paredon, Sen, and Tecominoacan), and ten are in the Sonda de Campeche area (Abkatun, Bacab, Batab, Caan, Chuc, Ek, Ku, Maloob, Pol, and Uech). Original reserves totaled approximately 23 billion bbl of liquid hydrocarbons BOE. The Chiapas-Tabasco (onshore) and Sonda de Campeche (offshore) areas are adjacent to each other and are similar both geologically and in reservoir behavior (Figure 1). For this reason, the fields from both areas are covered together, with references to regional variations that illustrate the differences among them. Some of the giant oil fields of southeastern Mexico were described by Santiago (1980).