Top 5 Actor's With Most Oscar Win's.

1.Katharine Hepburn — 4 wins, 12 nominations

Katharine Houghton Hepburn (May 12, 1907 – June 29, 2003) was an American actress who was a leading lady in Hollywood for more than 60 years. She appeared in a range of genres, from screwball comedy to literary drama, and she received a record four Academy Awards for Lead Acting Performances, plus eight further nominations. 

In 1999, Hepburn was named by the American Film Institute the greatest female star of Classic Hollywood Cinema. She was known for her fierce independence and spirited personality.

Best actress: "Morning Glory" (1933), "Guess Who's Coming to Dinner" (1967), "The Lion in Winter" (1968), "On Golden Pond" (1981).

2.Daniel Day-Lewis — 3 wins, 6 nominations.

Sir Daniel Michael Blake Day-Lewis (born 29 April 1957) is a retired English actor with dual British and Irish citizenship. One of the most respected actors of his generation, he has also been hailed as one of the greatest actors in cinematic history. His numerous awards include three Academy Awards for Best Actor, making him the only male actor to have three wins in that category and one of only three male actors to win three Oscars.

 He won four BAFTA Awards for Best Actor, three Screen Actors Guild Awards and two Golden Globe Awards. In June 2014, Day-Lewis received a knighthood for services to drama.

Best actor: "My Left Foot" (1989), "There Will Be Blood" (2007), "Lincoln" (2012)

3.Meryl Streep — 3 wins, 21 nominations

Mary Louise "Meryl" Streep (born June 22, 1949) is an American actress. Often described as the "best actress of her generation",Streep is particularly known for her versatility and accents. Nominated for a record 21 Academy Awards, she has won three.Among other accolades, she has received a record 32 Golden Globe nominations, and has won eight.

Best actress: "Sophie's Choice" (1982), "The Iron Lady" (2011)

Best supporting actress: "Kramer vs. Kramer" (1979)

4.Jack Nicholson — 3 wins, 12 nominations

John Joseph Nicholson (born April 22, 1937) is an American retired actor and filmmaker whose career spanned more than 60 years. He is known for having played a wide range of starring or supporting roles, including comedy, romance, and darkly comic portrayals of anti-heroes and villainous characters. In many of his films, he played the "eternal outsider, the sardonic drifter", someone who rebels against the social structure.

Best actor: "One Flew Over the Cuckoo's Nest" (1975), "As Good as It Gets" (1997)

Best supporting actor: "Terms of Endearment" (1983)

5.Ingrid Bergman — 3 wins, 7 nominations

Ingrid Bergman (29 August 1915 – 29 August 1982) was a Swedish actress who starred in a variety of European and American films, television movies, and plays. She won many accolades, including three Academy Awards, two Primetime Emmy Awards, a Tony Award, four Golden Globe Awards, and a BAFTA Award.

Bergman was born in Stockholm to a Swedish father and a German mother, and started her acting career in Swedish and German films. Her introduction to Americans came in the English-language remake of Intermezzo (1939)

Best actress: "Gaslight" (1944), "Anastasia" (1956)

Best supporting actress: "Murder on the Orient Express" (1974)