The movie Spencer's Mountain(1963) which starred Glenn Ford and Maureen O'Hara would later become a TV show that lasted 9 seasons(1972-1981) called The Waltons.
The Courtship Of Eddie's Father(1963) which starred Glenn Ford and Ronny Howard would become a TV show from 1969 to 1972 which starred Bill Bixby and Brandon Cruz.
Of course,The Odd Couple(1968) which starred Jack Lemmon and Walter Mattheau would become a TV show starring Tony Randall and Jack Klugman from 1970 to 1975.
Voyage To The Bottom Of The Sea(1961) would become a TV series from 1964 to 1968.
Peyton Place(1957) would become a night time soap opera on ABC from 1964 to 1969. Even the sequel to the movie Return To Peyton Place(1961) would spawn a TV sequel as well with the daytime soap on NBC by the same name which lasted from 1972 to 1974.
How To Marry A Millionaire(1953) which starred Marilyn Monroe in the movie would become a TV show from 1958 to 1960 starring Barbara Eden in the Marilyn Monroe role.
Yours,Mine And Ours(1968) which starred Lucille Ball and Henry Fonda would later become the TV show The Brady Bunch starring Florence Henderson and Robert Reed from 1969 to 1974.
A couple of other movies that could be loosely based on later TV shows.
The Brass Bottle(1964) starring Barbara Eden,Tony Randall and Burl Ives would later be the catalyst for I Dream Of Jeannie.
Three Men And A Baby(1987) starring Tom Selleck,Ted Danson,and Steve Guttenburg would later be the catalyst for the TV show Full House.