Most Oscars won - Best Actress

The artist to have won the most Oscars in a starring role is Katharine Hepburn (USA) (b.12 May 1907 d. 29 June 2003) with four, for Morning Glory (USA 1933) in 1934, Guess Whos Coming to Dinner (USA 1967) in 1968, The Lion in Winter (UK 1968) in 1969 and On Golden Pond (USA 1981) in 1982. 

Nominated 12 times for: 
1962 - Long Day's Journey into Night, 
1959 - Suddenly, Last Summer, 
1956 - The Rainmaker, 
1955 - Summertime, 
1951 - The African Queen, 
1942 - Woman of the Year, 
1940 - The Philadelphia Story, 
1935 - Alice Adams, 

She also enjoys the distinction of having the longest award-winning career, spanning 48 years.