Currently available on 1 streaming service.

Harriet the Spy - watch online: streaming, buy or rent

Currently you are able to watch "Harriet the Spy" streaming on Apple TV Plus.

Cast

Beanie Feldstein
Harriet M. Welsch (voice)
Jane Lynch
Ole Golly (voice)
Lacey Chabert
Marion Hawthorne (voice)
Kimberly Brooks
Janie (voice)
Crispin Freeman
Mr. Welsch / Mr. Withers (voice)
Grey DeLisle
Mrs. Welsch (voice)
Bumper Robinson
Mr. Horatio / Doorman (voice)
Charlie Schlatter
Sport (voice)