This is the viewing order for the DCAU
according to Wikipedia
The definitive list of the DC Universe Animated Original Movies. This includes all movies before the continuity shift in Flashpoint Paradox and the 2 Collections for the 2 part films.
Created by Velocity
DC Animated Movies
All DC animated movies and shorts
DC animated stand-alone movies don't share continuity with each other or other movies.
Movies, Series, Miniseries or Documentaries acted in, or featuring Lucy Lawless.
DC Animation movies I plan to watch
DC Animated Universe
by Aaron Browne