Code Geass: Hangyaku no Lelouch III - Oudou

SRW V - SRW 30

A comprehensive watch order of the Code Geass series, which includes every entry of the Code Geass franchise.
Original Guide: https://myanimelist.net/forum/?topicid=1865930

Not listed:
1-7. Geass: Hangyaku no Lelouch DVD Magazine Picture Drama
Short episodes included in the "Code Geass DVD Magazine".
(Belongs to first series) (Cannot be found on "Add Items" list)

AEGC Interest Stack index: https://myanimelist.net/forum/?topicid=2017008

These are the anime that appear in Super Robot Wars 30 for PS4, Switch, and Steam on PC.

A compilation of anime that began airing during the month of May.

this month is most notable for its two samurai shows, samurai champloo directed by Cowboy Bebop Legend Shinichirou Watanabe, and Afro Samurai starring Samuel L Jackson.

See Also:

January: https://myanimelist.net/stacks/15005
February: https://myanimelist.net/stacks/15006
March: https://myanimelist.net/stacks/15017
April: https://myanimelist.net/stacks/15029
June: https://myanimelist.net/stacks/15041
July: https://myanimelist.net/stacks/15044
August: ttps://myanimelist.net/stacks/15051
September: https://myanimelist.net/stacks/15053
October: https://myanimelist.net/stacks/15101
November: https://myanimelist.net/stacks/15102
December: https://myanimelist.net/stacks/15104

All Code Geass anime in chronological order

A comprehensive watch order of the Code Geass series, which includes every entry in the Code Geass franchise.

This guide is fully maintained, retouched, reorganized and updated by yours truly.

All other published "Series Guides" by me that might interest you:
https://myanimelist.net/profile/nrhkm/stacks

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PRECEDENT UNIVERSE
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1. Code Geass: Hangyaku no Lelouch
TV - 25 x 24 minute long episodes. R - 17+ rated.
First season in the original run.

1-1. Code Geass: Hangyaku no Lelouch Recaps
Special - 2 x 24 minute long episodes. PG-13 rated.
Recap episodes known also as episodes 8.5 and 17.5. Watch after episodes 8 and 17 of the first season.

1-2. Code Geass: Hangyaku no Lelouch Picture Drama - Hajimari no Zenya
Special - 1 x 3 minute long episode. PG-13 rated.
Picture drama backstory before the events of the first season.

1-3. Code Geass: Hangyaku no Lelouch Picture Drama
Special - 9 x 4 minute long episodes. PG-13 rated.
Picture drama side-stories that take place alongside the events of the first season.

1-4. Code Geass: Hangyaku no Lelouch DVD Magazine Picture Drama
Special - 4 x 4 minute long episodes. PG-13 rated.
Short episodes included in the "Code Geass DVD Magazine".

1-5. Code Geass: Hangyaku no Lelouch DVD Magazine: Omake Flash - Baba Theater
Special - 2 x 1 minute long episodes. PG-13 rated.
Flash anime specials included in the "Code Geass DVD Magazine."

1-6. Code Geass: Hangyaku no Lelouch Special Edition - Black Rebellion
OVA - 1 x 1h 57 minute long episode. R - 17+ rated.
OVA summarizing all 25 episodes of the first season from Lelouch's perspective.

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2. Code Geass: Hangyaku no Lelouch R2
TV - 25 x 24 minute long episodes. R - 17+ rated.
Second season in the original run.

2-1. Code Geass: Hangyaku no Lelouch R2 Picture Drama - Last Moratorium
Special - 1 x 11 minute long episode. PG-13 rated.
Picture drama story that takes place after episode 12 of the second season.

2-2. Code Geass: Hangyaku no Lelouch R2 Picture Drama
Special - 9 x 5 minute long episodes. PG-13 rated.
Picture drama side-stories that take place alongside the events of the second season.

2-3. Code Geass: Hangyaku no Lelouch R2 Omake Flash
Special - 9 x 1 minute long episodes. PG-13 rated.
Flash anime specials included in the Blu-ray and DVD releases of the second season.

2-4. Code Geass: Hangyaku no Lelouch R2 Special Edition - Zero Requiem
OVA - 1 x 1h 56 minute long episode. R - 17+ rated.
OVA summarizing all 25 episodes of the second season.

2-5. Code Geass: Hangyaku no Lelouch - Kiseki no Birthday
Special - 1 x 27 minute long episode. PG-13 rated.
Picture drama that takes place after the events of the second season.

2-6. Code Geass: Hangyaku no Lelouch - Kiseki no Birthday Omake Flash
Special - 1 x 3 minute long episode. PG-13 rated.
Flash anime specials included in the Blu-ray and DVD releases of Kiseki no Birthday.

2-7. Code Geass: Hangyaku no Lelouch - Nunnally in Wonderland
OVA - 1 x 28 minute long episode. PG-13 rated.
Spin-off episode that parodies Alice in Wonderland.

2-8. Code Geass: Hangyaku no Lelouch Picture Drama - Kiseki no Anniversary
Special - 1 x 16 minute long episode. PG-13 rated.
Picture drama special released on the series' 10th anniversary.

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PRECEDENT UNIVERSE SPIN-OFFS
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3. Code Geass: Boukoku no Akito 1 - Yokuryuu wa Maiorita
Movie - 51 minutes long. R - 17+ rated.
First film in a 5-movie spin-off saga that takes place in between the first and second season, but suggested to watch after finishing the second season.

4. Code Geass: Boukoku no Akito 2 - Hikisakareshi Yokuryuu
Movie - 59 minutes long. R - 17+ rated.
Second film in the saga.

4-1. Code Geass: Boukoku no Akito 2 - Hikisakareshi Yokuryuu Picture Drama
Special - 1 x 12 minute long episode. PG-13 rated.
Picture drama included in the Blu-ray and DVD releases of the second spin-off film.

5. Code Geass: Boukoku no Akito 3 - Kagayaku Mono Ten yori Otsu
Movie - 59 minutes long. R - 17+ rated.
Third film in the saga.

5-1. Code Geass: Boukoku no Akito 3 - Kagayaku Mono Ten yori Otsu Picture Drama
Special - 1 x 6 minute long episode. PG-13 rated.
Picture drama included in the Blu-ray and DVD releases of the third spin-off film.

6. Code Geass: Boukoku no Akito 4 - Nikushimi no Kioku kara
Movie - 59 minutes long. R - 17+ rated.
Fourth film in the saga.

6-1. Code Geass: Boukoku no Akito 4 - Nikushimi no Kioku kara Picture Drama
Special - 1 x 9 minute long episode. PG-13 rated.
Picture drama included in the Blu-ray and DVD releases of the fourth spin-off film.

7. Code Geass: Boukoku no Akito 5 - Itoshiki Mono-tachi e
Movie - 59 minutes long. R+ rated.
Fifth film in the saga.

7-1. Code Geass: Boukoku no Akito 5 - Itoshiki Mono-tachi e Picture Drama
Special - 1 x 8 minute long episode. PG-13 rated.
Picture drama included in the Blu-ray and DVD releases of the fifth spin-off film.

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8. Code Geass: Soubou no Oz Picture Drama
OVA - 5 x 3 minute long episodes. PG-13 rated.
Picture drama adapting from the manga of a separate Code Geass spin-off title with its own story, also takes place in between the first and second season.

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SUPERSEDED UNIVERSE
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9. Code Geass: Hangyaku no Lelouch I - Koudou
Movie - 2h 15 minutes long. R+ rated.
First film in a trilogy. An overhaul of the original to serve as a new universe of its own. Events that had been established in the original were reworked or altered to allow a continuation in the franchise's storyline, after which all future projects will follow from. Should be watched after completing the series within the Precedent Universe.

9-1. Code Geass: Hangyaku no Lelouch Picture Drama - Kamen Kokuhaku Taikai
Special - 1 x 10 minute long episode. PG-13 rated.
Picture drama bonus included in a special DVD given with ticket purchases for the film.

9-2. Code Geass: Hangyaku no Lelouch II - Handou
Movie - 2h 12 minutes long. R - 17+ rated.
Second film in the trilogy.

9-3. Code Geass: Hangyaku no Lelouch III - Oudou
Movie - 2h 20 minutes long. R - 17+ rated.
Third film in the trilogy.

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10. Code Geass: Fukkatsu no Lelouch
Movie - 1h 52 minutes long. R - 17+ rated.
Sequel film to the movie trilogy.

10-1. Code Geass: Fukkatsu no Lelouch Picture Drama
Special - 2 x 9 minute long episodes. R - 17+ rated.
Picture drama included in the Blu-ray and DVD releases of the sequel film.

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11. Code Geass: Dakkan no Rozé
Movie - ? minutes long. ? rated.
Not yet aired. New Code Geass project for the franchise by Studio Sunrise.

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*For those who pursue the route of watching episodes in hardcore chronological order:

1. S1 Picture Drama - Ep 1
2. Picture Drama - Hajimari no Zenya
3. S1 - Ep 1-3
4. S1 Picture Drama - Ep 2
5. S1 Picture Drama - Ep 3
6. S1 - Ep 4-6
7. S1 Picture Drama - Ep 4
8. S1 - Ep 7-8
9. S1 Recaps - Ep 1
10. S1 Picture Drama - Ep 5
11. S1 - Ep 9
12. S1 Picture Drama - Ep 6
13. S1 Picture Drama - Ep 7
14. S1 - Ep 10-17
15. S1 Recaps - Ep 2
16. S1 - Ep 18-21
17. S1 Picture Drama - Ep 8
18. S1 - Ep 22-23
19. S1 Picture Drama - Ep 9
20. S1 - Ep 24-25
21. S1 Special - Black Rebellion

22. Boukoku no Akito 1
23. Boukoku no Akito 2
24. Boukoku no Akito 2 Picture Drama
25. Boukoku no Akito 3
26. Boukoku no Akito 3 Picture Drama
27. Boukoku no Akito 4
28. Boukoku no Akito 4 Picture Drama
29. Boukoku no Akito 5
30. Boukoku no Akito 5 Picture Drama

31. R2 Picture Drama - Ep 1
32. R2 Picture Drama - Ep 2
33. R2 - Ep 1-7
34. R2 Picture Drama - Ep 3
35. R2 - Ep 8-9
36. R2 Picture Drama - Ep 4
37. R2 - Ep 10-12
38. R2 Picture Drama - Last Moratorium
39. R2 Picture Drama - Ep 5
40. R2 Picture Drama - Ep 6
41. R2 - Ep 13-18
42. R2 Picture Drama - Ep 7
43. R2 - Ep 19-21
44. R2 Picture Drama - Ep 8
45. R2 - Ep 22-25
46. R2 Special - Zero Requiem
47. R2 Picture Drama - Ep 9
48. Kiseki no Birthday
49. Nunnally in Wonderland
50. Picture Drama - Kiseki no Anniversary

51. Movie I - Koudou
52. Movie I Picture Drama
53. Movie II - Handou
54. Movie III - Oudou
55. Fukkatsu no Lelouch
56. Fukkatsu no Lelouch Picture Drama
57. Dakkan no Rozé

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Resources used:
https://myanimelist.net/forum/?topicid=1863965
https://myanimelist.net/forum/?topicid=2017008
https://chiaki.site/?/tools/watch_order

Special thanks and credits to:
https://myanimelist.net/profile/_cjessop19_
https://myanimelist.net/profile/User-Name
https://myanimelist.net/clubs.php?cid=79626

Recommended Order (for those new to the franchise):

Code Geass: Lelouch of the Rebellion [Season 1] (original timeline)
Code Geass: Lelouch of the Rebellion [Season 2] (original timeline)

And if you're craving for more...

Code Geass: Lelouch of the Re;surrection (alternate timeline)
Code Geass: Akito the Exiled Movies (original timeline; between Seasons 1 & 2)


Chronological Order (not recommended for those new to the franchise):

ORIGINAL TIMELINE
Code Geass: Lelouch of the Rebellion [Season 1]
Code Geass: Akito the Exiled Movies
Code Geass: Lelouch of the Rebellion R2 [Season 2]

ALTERNATE TIMELINE
Code Geass: Lelouch of the Rebellion I - Initiation
Code Geass: Lelouch of the Rebellion II - Transgression
Code Geass: Lelouch of the Rebellion III - Glorification
Code Geass: Lelouch of the Re;surrection

source: https://akurasu.net/wiki/Super_Robot_Wars/Master_Series_list
Part 1: https://myanimelist.net/stacks/60399/
Part 2: https://myanimelist.net/stacks/60670/
Part 3: https://myanimelist.net/stacks/60675/
Part 5: https://myanimelist.net/stacks/60806/
Manga and LNs: https://myanimelist.net/stacks/60403/