- The American Film Institute voted her the greatest American female screen legend of all time.
- Katharine almost became a professional tennis player.
- Katharine was the winner of the Best Actress Oscar 4 times.
- Katharine was nominated for Academy Awards 12 times during her life.
- In 1958, Katharine was named the Woman of the Year from the Hasty Pudding Theatricals.
- In 1989, Katharine was the recipient of the Lifetime Achievement Award at the American Comedy Awards.
- Katharine won an Academy Award for the third film she made, 1933's Morning Glory.
- Her only marriage was to Ludlow Ogden Smith in 1928. The two divorced in 1934.
- In 1928, Katharine received a Bachelor of the Arts degree in History and Philosophy from Bryn Mawr College in Bryn Mawr, Pennsylvania.
- In 1928, Katharine received a Bachelor of the Arts degree in History and Philosophy from Bryn Mawr College in Bryn Mawr, Pennsylvania.
- Katharine's mother, Katharine Houghton was a co-founder of Planned Parenthood.
- Katharine was of English and Scottish descent.
- Katharine was actually a natural red head.
- She was once voted the "2nd Greatest Movie Star of All Time" by Entertainment Weekly.
- Katharine made 9 films with Spencer Tracy, the first of which was the 1942 film Woman of the Year.
- Katharine turned down the role of Marilla in the 1985 telefilm Anne of Green Gables , but recommended her great-niece, Schuyler Grant for the role of Anne. Schuyler ended up playing Diana instead.
- Katharine was a direct descendant of Britain's King John through one of his illegitimate children.
- In 1990, Katharine was recipient of the Kennedy Center Honor.
- She won four Best Actress Oscars: in 1933, 1967, 1968 and 1982.
- Katharine admitted to using her brother's birthdate as her own for years.
- Katharine was the great-aunt of Schuyler Grant who played Diana Barry in the Anne of Green Gables miniseries that aired in the 1980's.
