In music notation, A# and Bb are 2 different ways of writing the same chord. And this site defaults to whichever enharmonic version comes first alphabetically. For more on this, be sure to check out this Video or Article.
Lastly, there are many ways to play the same chord. And I created the diagrams below for my tiny elf hands (and fat dwarf fingers).
If you'd prefer to use different ukulele chord fingerings, you can find alternate versions here.
The 23 Most Important Ukulele Chords
Click on any diagram to watch a "how to" video.
Ready Put These Ukulele Chords to Work?
With this free Search Tool, just plug in any of the ukulele chords above. And you'll find hundreds (if not thousands) of easy songs to play.