Portia Nelson (May 27, 1920 – March 6, 2001) was a popular American singer, songwriter, actress, and author.
She was best known for her 1965 portrayal of the cantankerous Sister Berthe in the film version of The Sound of Music. Her book of poetic musings, There's a Hole IN My Sidewalk: The Romance of Sel-Discovery, became a mainstay of 12 Step programs. .