The MCU (Marvel Cinematic Universe) — lead by some terrific people, including Kevin Feige — officially began in 2008 with the release of Iron Man. Marvel took a huge gamble, and not just in Robert Downey, Jr. as the lead, but in the franchise itself; but, thanks to Feige, RDJ, and director/co-star Jon Favreau, Iron Man jump-started a franchise that would expand beyond everyone’s wildest dreams and become beloved by fans all over the world — myself included.
One way to rewatch the MCU is in chronological order — when they occur in the franchise timeline, not necessarily when they were released (see below):
1. Captain America: The First Avenger (WWII; 2012)
2. Captain Marvel (1995)
3. Iron Man (2010)
4. Iron Man 2 (2010)
5. Thor (2011)
6. The Avengers (2012)
7. Iron Man 3 (2013)
8. Thor: The Dark World (2013)
9. Captain America: The Winter Soldier (2014)
10. Guardians of the Galaxy, Vol. 1 (2014)
11. Guardians of the Galaxy, Vol. 2 (2014)
12. Avengers: Age of Ultron (2015)
13. Ant-Man (2015)
14. Captain America: Civil War (2016)
15. Spider-Man: Homecoming (2016-17)
16. Doctor Strange (2016)
17. Black Panther (2017)
18. Thor: Ragnarok (2017)
19. The Avengers: Infinity War (2017)
20. Ant-Man and the Wasp (2017)
21. Avengers: Endgame (2017; 2022; revisits 2012 and 2014)
22. Spider-Man: Far From Home (2022)
Feel free to click any of links above to see my MCU deep dives, including best and worst lines and vegan/animal-related shout-outs.
You can also watch the films in release order (my personal preference, as the mid- and post-credit scenes make more sense that way):
1. Iron Man (May 2008)
2. Iron Man 2 (April 2010)
3. Thor (April 2011)
4. Captain America: The First Avenger (July 2011)
5. The Avengers (April 2012)
6. Iron Man 3 (April 2013)
7. Thor: The Dark World (November 2013)
8. Captain America: The Winter Soldier (March 2014)
9. Guardians of the Galaxy Vol. 1 (July 2014)
10. Avengers: Age of Ultron (April 2015)
11. Ant-Man (July 2015)
12. Captain America: Civil War (April 2016)
13. Doctor Strange (October 2016)
14. Guardians of the Galaxy Vol. 2 (April 2017)
15. Spider-Man: Homecoming (July 2017)
16. Thor: Ragnarok (October 2017)
17. Black Panther (February 2018)
18. Avengers: Infinity War (April 2018)
19. Ant-Man and the Wasp (July 2018)
20. Captain Marvel (March 2019)
21. Avengers: Endgame (April 2019)
22. Spider-Man: Far From Home (July 2019)
23. Black Widow (May 2021)
24. Shang-Chi And The Legend Of The Ten Rings (July 2021)
25. The Eternals (November 2021)
26. Untitled Spider-Man 3 (December 2021)
27. Doctor Strange In The Multiverse Of Madness (March 2022)
28. Thor: Love And Thunder (May 2022)
29. Black Panther 2 (July 2022)
30. Captain Marvel 2 (November 2022)
31. Guardians of the Galaxy, Vol. 3 (TBD 2023)
32. Ant-Man And The Wasp: Quantumania (TBD)
33. Blade (TBD)
Note: You will see that I have noticeably left out 2008’s The Incredible Hulk; this was intentional. While it is technically considered part of the MCU, aside from a cameo from RDJ’s Tony Stark at the end and the presence of William Hurt’s general — who appears later in the franchise — there is nothing that really ties it to the MCU. Plus, seeing as Edward Norton is [rightfully] replaced with Mark Ruffalo as Bruce Banner, including this film in your MCU rewatch isn’t the best decision. But, that’s just my personal opinion. The film on its own, separate from the MCU, is actually fairly decent.
Marvel has also jumped into the streaming game, with a slew of Disney+ series:
-WandaVision (January 2021)
-The Falcon and the Winter Soldier (March 2021)
-Loki (May 2021)
-What If…? (Summer 2021)
-Hawkeye (TBA 2021)
-Ms. Marvel (2021)
-Moon Knight (2022)
-She-Hulk (2022)