Display screen or portion thereof with an animated graphical user interface

[0001]FIG. 1 is a front view of a first image in a sequence for a display screen or portion thereof with an animated graphical user interface, showing our new design;

[0002]FIG. 2 is a front view of a second image thereof;

[0003]FIG. 3 is a front view of a third image thereof;

[0004]FIG. 4 is a front view of a fourth image thereof;

[0005]FIG. 5 is a front view of a fifth image thereof;

[0006]FIG. 6 is a front view of a sixth image thereof; and,

[0007]FIG. 7 is a front view of a seventh image thereof.

[0008]The broken lines shown in the drawing illustrate a device and/or portions of the display screen or portion thereof with an animated graphical user interface that form no part of the claimed design.

[0009]The appearance of the animated image sequentially transitions between images shown in FIGS. 1 through 7. The process or period in which one image transitions to another image forms no part of the claimed design.