
Acting
Joyce Anne DeWitt (born April 23, 1949) is an American actress and comedian known for playing Janet Wood on the ABC sitcom Three's Company from 1977 to 1984.
Description above from the Wikipedia article Joyce DeWitt, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Ask Me to Dance
as Nana

The Savant
as Detective Randi Toney

Rock Story
as Judge Carol Ann Connelly

My Boyfriends' Dogs
as Nikki

The Great Fight
as Randi Toney

Failing Better Now
as Irene

Call of the Wild
as Jolene
Behind the Camera: The Unauthorized Story of 'Three's Company'
as Herself - Host
Spring Fling!
as Linda Hayden

Saturday's the Place!
as Hostess

Behind Closed Doors with Natalie Morales
as Herself · 1 ep.
Nudes in the News
as Janet (archive footage) · 1 ep.

Hope Island
as Laetitia Barton · 1 ep.

The Early Show
as Self - Guest · 1 ep.

Twitch City
as Self · 1 ep.

E! True Hollywood Story
3 ep.

Finder of Lost Loves
as Lynn Powell · 1 ep.

Supertrain
as Natalie Smithburne · 1 ep.

The Ropers
1 ep.

Presenting Susan Anton
1 ep.