(If you are new to MCU, then you should start with; Iron Man, The Incredible Hulk,
Iron Man 2, Thor, Captain America and then Agent Carter.)
There is a S.H.I.E.L.D spin-off mini-series, called Slingshot. It takes place right before Agents of S.H.I.E.L.D season 4.
(can be found at ABC's youtube channel).
Marvel Cinematic Universe tie-in comics :
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: https://www.alltimelines.com/marvel-multiverse-chronology/marvel-cinematic-universe-timeline/
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
28th of July 2017 28th of August 2017 27th of October 2017 (with exceptions, see below)
This list includes everything in the MCU by Marvel Studios in the probably best watching order - based on original release dates (e.g. Daredevil was written to be released after Age of Ultron), knowledge which otherwise gets lost in the shuffle (e.g. to understand a certain part of the ending of "Captain America: The First Avenger" you need to have watched "Thor" first. Also, a certain method is mentioned in 2x03 of SHIELD, which has its origin in the later shown first Agent Carter season, etc.) and timeline (when it comes to Netflix shows, as their placement based solely on release dates makes things iffy),
The list does not include movies where the movie rights are somewhere else, like the older Spiderman movies, X-Men (and its spinoffs like Deadpool) or the Fantanstic Four. They are not part of the MCU.