The 1965-1966 television season is the 20th network season in United States television history. It began on Monday, September 6, 1965 and ended on Sunday, April 24, 1966. The effective start date of the 1965-66 season for the purposes of audience measurement was Sunday, September 5, 1965 through Saturday, September 3, 1966.
Universe estimates used to calculate a program or network's rating within that particular demographic for the 1965-66 TV season.
| Demographic | Population | Share |
|---|---|---|
| Households | 53,850,000 | |
| Persons 2+ | 178,782,000 |