This is a list with episodes of various DC Entertainment TV series in internal chronological order, according to this list: https://geekritique.net/2015/05/19/arrow-and-the-flash-chronological-order

• The rest of Supergirl season 1 can be watched after S04E23 of Arrow.

2017-10-27: The post on geekritique.net, which this list is based on, hasn't been updated in roughly half a year, so I consider it to be abandoned. Thus I advise anyone using this list to use my other Trakt Arrowverse list instead: https://trakt.tv/users/nidunc/lists/arrowverse-viewing-order-according-to-thetimelinesite-com.
Besides, the geekritique.net list didn't include all episodes in the first place (see the above bullet point for an example), while thetimelinesite.com does include all episodes (and is still being updated).

I will still be checking geekritique.net from time to time, but I presume it won't be updated in the future.

This is a list with episodes of various DC Entertainment TV series in internal chronological order, according to this list: http://thetimelinesite.com/timelines/27-arrow-the-flash-tv-series-timeline.

2021-01-10: If you would like a more complete list of DC films and TV-series in chronological order, so more than just the Arrowverse, have a look at my Trakt port of a DC Cinematic Universe list (that was incidentally also originally started by DIrishB): https://trakt.tv/users/nidunc/lists/dc-cinematic-multiverse-viewing-order-according-to-thecomicboard-com-members?sort=rank,asc

Notes

• This so-called Arrowverse or shared multi-verse is also known as the DC CW Universe, as almost all TV-shows are produced by The CW (with the exception of Constantine and the first season of Supergirl)
  • Vixen and Freedom Fighters: The Ray are produced by CW Seed.
• Obviously this list doesn't include any comic books or other written work in the Arrowverse. It only includes episodes of the various TV-series and miniseries (and films too, if they are added to thetimelinesite.com).
• On this list I put season 1 of Arrow: Blood Rush (or Blood Rush: Arrow, according to trakt.tv) between season 1 and 2 of Arrow. You should actually watch it between episodes S02E05 and S02E06 of Arrow.

Changelog

• 2017-02-06: thetimelinesite.com seems to be undergoing maintenance at the moment (the above page has resulted in a 404 error for the past few days).
• 2017-02-13: thetimelinesite.com is working correctly again.
• 2017-03-14: Updates from thetimelinesite.com incorporated into this list.
• 2017-04-20: Updates from thetimelinesite.com incorporated into this list:
  • Added Supergirl 2x15 till Legends of Tomorrow 2x17.
• 2017-05-17: Updates from thetimelinesite.com incorporated into this list:
  • Added Supergirl 2x18 till The Flash 3x20;
  • Moved Arrow 5x17 and 5x18 and The Flash 3x18.
• 2017-05-29: Updates from thetimelinesite.com incorporated into this list:
  • Added The Flash 2x21 till 2x23 and everything in between.
• 2017-10-27: Updates from thetimelinesite.com incorporated into this list:
  • Added Legends of Tomorrow 3x01, 3x02 and all episodes in between.
    • Except for Arrow 6x02, of which the position is still uncertain.
• 2017-12-15: Updates from thetimelinesite.com incorporated into this list:
  • Moved lots of episodes around;
  • Replaced Vixen season 1 and 2 with Vixen: The Movie (in season 2's position);
  • Added Freedom Fighters: The Ray season 1;
  • Added The Flash: Chronicles of Cisco webisodes;
  • Added Arrow 6x03 onwards.
• 2017-12-24: Added Arrow: Blood Rush season 1.
  • See the above note about its actual position in this list.
• 2018-01-30: Updates from thetimelinesite.com incorporated into this list:
  • Added Supergirl 3x10, The Flash 4x10 and Arrow 6x10.
• 2018-02-02: Updates from thetimelinesite.com incorporated into this list:
  • Added Supergirl 3x11 and 3x12, The Flash 4x11 and 4x12 and Arrow 6x11 and 6x12
• 2018-02-11: Updates from thetimelinesite.com incorporated into this list:
  • Added The Flash 4x13, Supergirl 3x13 and Arrow 6x13;
  • Moved Supergirl 3x12 and Arrow 6x12.
• 2018-03-03: Updates from thetimelinesite.com incorporated into this list:
  • Added The Flash (1990) season 1 (some episodes are intentionally out of order).
• 2018-03-27: Updates from thetimelinesite.com incorporated into this list:
  • Added Legends of Tomorrow 3x10
  • Added Arrow 6x14 to The Flash 4x15
• 2018-04-04: Updates from thetimelinesite.com incorporated into this list:
  • Moved Legends of Tomorrow 3x11 to 3x13
  • Added Legends of Tomorrow 4x14 to 4x16
  • Added The Flash 4x16 and Arrow 6x16
  • Switched The Flash 4x14 and Arrow 6x15
• 2018-06-11: Updates from thetimelinesite.com incorporated into this list:
  • Added Legends of Tomorrow 3x17 and 3x18
  • Added Supergirl 3x14 to 3x19
  • Added The Flash 4x17 and 4x18
  • Added Arrow 6x17 to 6x20
  • Moved Legends of Tomorrow 3x16, Arrow 6x12, Supergirl 3x12 and 3x13
• 2018-06-22: Changed episode format from S[S]E[E] to SxE, to reflect the format trakt.tv uses; updates from thetimelinesite.com incorporated into this list:
  • Moved Constantine 1x06
  • Switched Arrow 3x09 and The Flash 1x09
  • Switched Arrow 3x17 and The Flash 1x18
  • Switched Supergirl 1x05 and The Flash 2x07
  • Moved Legends of Tomorrow 2x16 and 2x17
  • Moved The Flash 4x03 and 4x04
  • Moved Supergirl 3x07
  • Added the rest of The Flash season 4, Arrow season 6 and Supergirl season 3
  • Moved Supergirl 3x19
• 2018-08: I heard the sad news that David Patrick O'Neil (DIrishB), the maintainer of thetimelinesite.com, has recently passed away. For the time being, this will have no consequences for this list (and the list on thetimelinesite.com, which this list is based on), as the new seasons of all the DC CW shows still have to start and DIrishB's list was already updated before he passed away to reflect all the changes so far.

This is a list with episodes of various Marvel Cinematic Universe (MCU) TV series as well as films in internal chronological order, according to this list by MythBank: https://mythbank.com/marvel-cinematic-universe-timeline/

DC aficionado too? Why, have a gander at my Trakt port of a list for all DC Cinematic Universe films and TV-series in chronological order: https://trakt.tv/users/nidunc/lists/dc-cinematic-multiverse-viewing-order-according-to-thecomicboard-com-members?sort=rank,asc

Unlike ‘my’ two Arrowverse lists on here, I’ve chosen not to include whole seasons, but only the episodes themselves, to maintain consistency throughout this list.
This is also to maximise compatibility with any third-party tools that interpret Trakt.tv lists.

I might choose to adapt my Arrowverse lists to this format as well in the future.

Up-to-date as of the 24th of July 2022 (with exceptions, see below). This description still has to be updated, as does the changelog. I don’t know when I’ll get around to that.

Not included

• All the comics and graphic novels (obviously)
• Captain Marvel (2019) (will be added to this list once it’s been released and its position in the timeline is certain)
  • Captain Marvel has been released; added on the 6th of May 2019.
• Other films and episodes that haven’t come out / aired yet (such as Spider-Man: Far From Home (2019))
• Marvel’s Agents of S.H.I.E.L.D.: Slingshot (between Captain America: Civil War and AoS 4x01)
  • Added on the 2nd of February 2018
• Marvel’s Inhumans 1x01 onwards (will add those episodes and films to this list once they’ve been released and their position in the timeline is certain)
  • Marvel’s Inhumans has premiered and is now included in the viewing order.
• The Stark Expo videos.
  • Those should be seen between Iron Man (2008) and The Incredible Hulk (2008) and can supposedly be watched at https://www.facebook.com/StarkExpo/, but I can’t find the actual videos there.
  • Some videos can be watched here, though: https://www.reddit.com/5cs17x.

The changelog of this list was moved to the comments on 2021-01-02 and is now being maintained there

This is a Trakt port of this list on The Comic Board (originally started by DIrishB—rest in peace-and continued by “Pro Bot” and other users after he passed away): https://www.thecomicboard.com/threads/dc-cinematic-multiverse-viewing-reading-order.14689/

Are you a Marvel connoisseur too? Then I’ve got you covered; here’s my Trakt port of a chronological list for the Marvel Cinematic Universe: https://trakt.tv/users/nidunc/lists/marvel-cinematic-universe-viewing-order-according-to-mythbank?sort=rank,asc

Not included (besides all the comics and other written material, obviously) ...

• ... due to not being released yet:
  • Zack Snyder’s Justice League (2021?)
    • Takes place between Aquaman (2018) and Lucifer 2x15
  • Lucifer 5x09–5x16
    • Those episodes take place right after the first eight episodes of the fifth season and before Shazam! (2019)
• ... due to not being listed on Trakt (source for some of the links is https://trakt.tv/comments/257392):
  • The Harley Quinn special feature from the Batman: Two-Face (2017) Blu-ray disc, available here: https://www.youtube.com/watch?v=VX2Ezmjlh4w.
    • Watch between Batman vs. Two-Face (2017) and Wonder Woman 2x01.
  • The Batman OnStar commercials, available here: https://www.youtube.com/playlist?list=PLhuYwq2xC45XmCmqZ8wbdJC2CSijtixGB.
    • Commercials 1 through 4 should be watched between Superman II: The Richard Donner Cut (2006) and Superman II (1980), while 5 and 6 should be watched between Smallville 2x01 and 2x02;
  • The Planet Krypton featurette/mini-‘documentary’ from the Man of Steel (2013) Blu-ray disc, available here: https://www.youtube.com/watch?v=64yro7Ibk68.
    • Watch between Arrow 2x23 and Titans 2x04.
  • Two Constantine videos; watch them between Titans 2x08 and Constantine 1x01
    1. Modern Mystery: Who is John Constantine? — https://www.youtube.com/watch?v=ks-Vy647FeA
    2. Ravenscar Institute Patient Debrief — https://www.youtube.com/watch?v=GQkSAaP99Eo
  • The The Return of Superman bonus scene from Justice League (2017), available here: https://www.youtube.com/watch?v=7jqi_0_LbU0.
    • Watch between Justice League (2017) and The Flash 3x11;
  • The Flash - Stretched webisodes
    1. Between The Flash 4x06 and 4x07 — https://www.youtube.com/watch?v=5sQ0WaTrvSY
    2. Between The Flash 4x07 and Supergirl 3x07 — https://www.youtube.com/watch?v=y1WNHYWIxA8
    3. Between The Flash 4x09 and DC’s Legends of Tomorrow 3x09 — https://www.youtube.com/watch?v=Q-EwHPqwcqQ
  • The Green Lantern: Rise of the Manhunters video game (available on Xbox 360, PlayStation 3, Nintendo [3]DS, Nintendo Wii, iOS).
    • Play it after watching Green Lantern (2011).
  • The Superhero Hooky featurette from the Shazam! (2019) Blu-ray disc, available here: https://www.youtube.com/watch?v=8jHYZjWAMkk.
    • Watch between Titans 2x13 and Black Lightning 3x01.

Notes

• Some episodes are intentionally out of order (sometimes being very far off from where one would expect them to be) — shows where this is the case are Wonder Woman, Lucifer, The Flash (1990), Supergirl, Titans et al.
  If you still think I made a mistake while porting the list on thecomicboard.com to Trakt, feel free to leave a comment;
• One should watch the Special Edition of Superman (1978);
• Vixen: The Movie (2017) should be watched in two parts; the first five(/four?) chapters take place on the spot where I placed it (so between Arrow 3x08 and The Flash 1x09) and the remaining chapters take place between Supergirl 1x04 and Arrow 4x07;
• One should watch the Extended Cut of Suicide Squad (2016);
• One should watch the Extended Cut of Green Lantern (2011);

According to the “Episode Listing” page on The Infosphere, The Futurama Wiki: https://theinfosphere.org/Episode_Listing.

The films were each broadcast on Comedy Central, and are listed on Disney+ (in season 6), as four parts, which makes 16 ‘episodes’ in total.

If you’re using Disney+, feel free to mark each film as watched after watching the fourth part (Trakt doesn’t have the films split up into four parts anywhere.)