Top 5 Roles?

Sophie's Choice
The Deer Hunter
Plenty
Doubt
One True Thing

The Deer Hunter - supporting role?
Kramer Vs. Kramer - Best actress in a supporting role
Silkwood
Doubt
Sophie's Choice (1982)

Evil Angels (aka A Cry in the Dark)
Postcards From the Edge
Silkwood
The Bridges of Madison County
Doubt

Kramer vs. Kramer
Sophie’s Choice
A Cry in the Dark
Defending Your Life
The Bridges of Madison County

Doubt.

Meryl is incredible. One of the best movies you'll ever see.
Viola Davis is in it for barely 10 minutes, but deserved a Oscar for her short role.

Incredible movie.

There are just too many. This was hard because she is great in everything, so these are my favourite top 5 roles that I can watch over and over again. :-)

The Deer Hunter
The Devil Wears Prada
Marvin's Room
The River Wild
Doubt