*Steve Buscemi - Ant-Man
Turned down the part of Hank Pym.
*Natalie Portman - Macbeth
She "dropped out for unknown reasons" and the part of Lady Macbeth went to Marion Cotillard.
*Christian Bale - Steve Jobs
-The part was offered to him twice by different directors (Danny Boyle and David Fincher).
-Bale turned it down as he felt that 'he wasn't right for the part'.
-Michael Fassbender got the part but he agreed that Christian Bale was "perfect" for the part:
"I thought to myself: Christian Bale is perfect, why isn't he doing it?...
I actually called him up and told him that myself."
*Viggo Mortensen - The Hateful Eight
He had to refuse due to "conflicting schedules". The role of Jody went to ♥Charming Potato ♥
*Gary Oldman - Spectre
He turned down the part to play a ~Bond villain because he wasn't willing to commit to
six months of filming all over the world. The part went to Christoph Waltz.
Source: whatculture.com