The Cadillac Series 61 was Cadillac's mainstream product model range. It was priced and equipped more modestly below the limousine, GM D platform Cadillac Series 85, Cadillac Series 90, Cadillac Series 72, Cadillac Series 67, and Cadillac Fleetwood Series 75. It was upgraded to the Series 62 in 1940 only to return to production in model year 1941, replacing the cancelled LaSalle Series 50. While production was suspended from model years 1943–1945 due to World War II, it remained as the junior level product line until 1951. The size, equipment list and quality level were the most popular with buyers who wanted a prestigious luxury car that was usually driven by the owner, while the longer cars were chauffeur driven. It combined the most popular features of the previous Series 60 and Series 65 and was priced at the same level as Buick products of the time.

The Cadillac Series 40-62 is a series of cars which was produced by Cadillac from 1940 through 1964. Originally designed to complement the entry level Series 61, it became the Cadillac Series 6200 in 1959, and remained that until it was renamed to Cadillac Calais for the 1965 model year. The Series 62 was also marketed as the Sixty-Two and the Series Sixty-Two. The Series 62 was used to introduce the Cadillac Coupe de Ville and the Cadillac Eldorado which started out as special appearance packages that were later placed into production.