Best of each decade - Billy Wilder

I scrolled through to see if you only meant director works, and it looks like you do. Probably for the best.

1940s
Double Indemnity
Five Graves to Cairo

1950s.
Stalag 17
Ace in the Hole (kind of by default, not great, just "best of the rest"

1960s
The Fortune Cookie
Kiss Me Stupid

1970s
The Front Page
Avanti!