The Fox and the Hound, man..."Goodbye May Seem Forever" literally never fails to make me cry, as someone who's done wildlife rehabilitation...
Honorable mention goes to Dumbo, Bambi, and Wreck-it Ralph. For the latter, in addition to the scene mentioned above, I also kinda bawled at
Ralph repeating the Bad Anon mantra while performing his heroic sacrifice. Just...the Iron Giant - type of feels there.
For Pixar, Up. Just...Up. That scene. You all know the one. In addition to THAT scene,
Kevin crying out in desperation to her far-off hatchlings, knowing that she's trapped, the implications of Russel's fractured family life, "I was hiding under your porch because I love you" and the Dug scene that proceeds it, "Thanks for the adventure, now go have a new one!", and the Ellie Badge...Up tore me apart on the inside...
And on a different note, Marvel's Guardians of the Galaxy.
Peter Quill/Star Lord's guilt surrounding his mom's battle with cancer and not taking her hand, Rocket's surprisingly emotional drunken rant about the torture the animal testing involved, and the three words that brought the entire theater to tears, "We...are...Groot."
Disney likes to set off my waterworks.