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Inventor, experimenter, mediator and persuader Harley Diaz maneuvers her way through the bustle that comes with being part of her happy family of nine, from the unique vantage point of being a tween middle child. The heartfelt and comedic stories of a big family find Harley devising creative ways to cope with – and stand out – in her family’s busy suburban Massachusetts household. Her ingenuity often wins the day for the Diaz family, even with many different personalities living under one roof The Diaz parents, Suzy and Tom, also have six other kids: Rachel the somewhat self-involved eldest; Georgie, a motivational athlete; Ethan, Harley’s closest ally; invincible and indestructible twins Lewie and "Beast"; and the strong-willed "baby" of the family, Daphne.
- Jenna Ortega as Harley Diaz
- Ronni Hawk as Rachel Diaz
- Isaak Presley as Ethan Diaz
- Ariana Greenblatt as Daphne Diaz
- Kayla Maisonet as Georgie Diaz
- Nicolas Bechtel as Lewie Diaz
- Malachi Barton as Beast Diaz
- Cerina Vincent as Suzy Diaz
- Joe Nieves as Tom Diaz
- Main article: Episode Guide
These are episodes that have confirmed titles and dates.
- 02/03/17 - Stuck in the Waterpark - The Movie (201-202)
- 02/10/17 - Stuck in a Commercial (203)
- 02/17/17 - Stuck in the School Photo (204)
- 02/24/17 - Stuck in a Slushy War (205)
- 03/03/17 - Stuck in the Garage Sale (207)
- 04/07/17 - Stuck in the Diaz Easter (206)
- 04/14/17 - Stuck in the Beast-day Party (208)
- 04/21/17 - Stuck without Devices (210)
- 04/28/17 - Stuck with a Boy Genius (211)
- 06/02/17 - Stuck with a Bad Influence (212)
- 06/09/17 - Stuck in a Good Deed (216)
- 06/16/17 - Stuck Dancing with My Dad (215)
- 06/23/17 - Stuck in a Gold Medal Performance (209)
- 09/15/17 - Stuck in a New Room (220)
- 09/22/17 - Stuck with a Dangerous House (214)
- 09/29/17 - Stuck with a New Friend (219)
- 10/06/17 - Stuck in a Merry Scary (221)
- 10/13/17 - Stuck with a Hook, Line and Sinker (217)
- 10/20/17 - Stuck in the Babysitting Nightmare (218)
- 10/27/17 - Stuck in the Diaz Awards (213)
- Stuck in the Middle is the first Disney Channel Original Series since Shake It Up (Season 2) to have more than 7 cast members.
- Confirmed guest stars for the season include Robbie Davidson and Nicholas Jabonero.
- The cast returned to the set on August 15, 2016, and the first table read took place on September 2, 2016. Production on the season wrapped on March 16, 2017.
- With the first 2 episodes of the season being advertised as one movie, this season has 20 advertised episodes.
- This season will feature more episodes than the show's first season.
- The first season had 17 episodes while this season will have 20.
- This season will feature the first Halloween special of the series.