John Lewis & Partners is known in Britain for their Christmas ads. Here is a great one, The Beginner:
I gather a British clothing company called The Binge has a recurring "cat and dog" advert. Here is their Christmas one:
Moving to this side of the pond, Canada seems to have a "bird" theme this year.
First, Tim Horton:
Next, Air Canada:
Here is one I liked too, from the American supermarket Kroger:
Here is a great one from two years ago, from a German pharmacy chain:
And this is likely the best Christmas ad ever done - British supermarket Sainsbury's 2014 ad, titled 1914: