CREATE TABLE table_31809 ("Nomination" TEXT, "Actor's Name" TEXT, "Film Name" TEXT, "Director" TEXT, "Country" TEXT)

Tell me the director nominated for best actor in a leading role
SELECT "Director" FROM table_31809 WHERE "Nomination" = 'best actor in a leading role'
SELECT "Director" FROM "table_31809" WHERE "Nomination" = 'best actor in a leading role'