Movies, Specials, and TV shows that are canon to the MCU.
One controversial addition to this list: Ang Lee's "Hulk" (2003). Although it was not produced by Marvel Studios, "The Incredible Hulk" (2008), which was produced by Marvel Studios, picks up from where "Hulk" left off, albeit with a complete recasting of all roles. This, in effect, back doors "Hulk" into the MCU, although it is not up to the standards set by Marvel Studios.
I left "Marvel's Agents of S.H.I.E.L.D." off the list because it's status as being canon is in dispute. Kevin Feige has stated that the TV shows made by Marvel Television (before it was absorbed into Marvel Studios) are separate from the MCU. It can be argued that the first two seasons are canon because of appearances from MCU characters, and ties to the MCU movies. However, AoS diverges from canon in later seasons, such as the appearance of the Darkhold being different from the Darkhold seen in "WandaVision".