More than 700 adults whose mother or mother-in-law was alive voted for the TV mom who was "closest to your own mom in spirit" in the survey by Opinion Research Corporation, the New York Daily News reported Tuesday.
"The Cosby Show" ended in 1992.
Rashad, 55, currently is starring with Sean Combs in the Broadway production of "A Raisin in the Sun.
Mrs. Cunningham of "Happy Days," played by Marion Ross, was the second favorite TV mom, followed by cartoon Marge Simpson of "The Simpsons."
Aaron Carter is still in love with Hilary Duff
Ray Liotta sues skin care company over use of likeness