According to Official Guinness Records,
The most Laurence Olivier awards won by an actor is six, by Sir Ian McKellen (UK). 1977, Actor of the Year in a Revival for Pillars of the Community
1978, Best Comedy Performance for The Alchemist
1979, Actor in a New Play for Bent
1984, Actor of the Year in a Revival for Wild Honey
1991, Best Actor for Richard III
2006, The Society's Special Award
For a complete list of 2006 records, please visit 2006 Guinness Records in United Kingdom.