|No. of episodes||20|
| Season chronology
- Jordan Kyle and Lilith will be introduced.
- Ollie and Samantha are set to return.
- Helen Blackthorn may be featured.
- Luke will get a potential love interest.
- The first half of the season will heavily feature City of Fallen Angels elements/events.
- Director Joshua Butler (who directed By the Light of Dawn) and Paul Wesley (Day of Atonement) may return to direct more episodes.
- Edom will be featured (either through stories or visited) once again.
Cast and characters
- Katherine McNamara as Clary Fairchild
- Dominic Sherwood as Jace Herondale
- Alberto Rosende as Simon Lewis
- Matthew Daddario as Alec Lightwood
- Emeraude Toubia as Isabelle Lightwood
- Alisha Wainwright as Maia Roberts
- Isaiah Mustafa as Luke Garroway
- Harry Shum Jr. as Magnus Bane
- Alan Van Sprang as Valentine Morgenstern
- David Castro as Raphael Santiago
- Will Tudor as Jonathan Christopher Morgenstern
|Image||Title||Written by||Directed by||Original Airdate||Episode|
|Shadowhunters: 3001 TBA||Todd & Darren||Matt Hastings||2018||3x01||34|
The renewal for the season was announced on April 21, 2017, during a live chat on Facebook with the cast.
According to an earlier report, production is tentatively set to run from August 14, 2017 to May 18, 2018. Executive producer Matt Hastings confirmed that production is set to begin in August. The writers began to officially meet to work on the season on May 30, 2017.
- ↑ 1.0 1.1 Live video chat announcement — Shadowhunters on Facebook
- ↑ ‘Shadowhunters’ Renewed For Season 3 By Freeform | Deadline
- ↑ 3.0 3.1 3.2 3.3 https://www.youtube.com/watch?v=P93b40-UCeo
- ↑ https://twitter.com/toddzer1/status/881754957136842752
- ↑ https://twitter.com/toddzer1/status/814634550940700672
- ↑ https://twitter.com/toddzer1/status/878340538549755904
- ↑ https://twitter.com/toddzer1/status/887167932576407556
- ↑ Shadowhunters - Renewed for a 3rd Season | Spoiler TV
- ↑ https://twitter.com/mattdirector/status/861988109168386049
- ↑ "#shadowhunters Season 3 writers room now in session!" Darren Swimmer on Twitter
- ↑ "Day 1!" Zoe Broad on Twitter
- ↑ "‘Shadowhunters’: Alisha Wainwright Upped To Regular For Season 3 – Comic-Con" - Deadline
- ↑ "@WainwrightAE is a series regular in Season 3! 🙌 #ShadowhuntersAtSDCC" Shadowhunters on Twitter