Social media fans have also noticed problems with Instagram and have taken to Twitter to complain.
At the time of writing, independent outage monitor Down Detector has registered almost 5,000 reports from users insisting WhatsApp is experiencing an outage. Europe, the United States and parts of Asia appear to be the worst hit locations.
Facebook and Instagram are both inaccessible, with news feeds refusing to refresh and the main Facebook.com domain unavailable, while WhatsApp messages aren't being sent or received, The Verge reported on Sunday.
The problems are also affecting Facebook, Facebook Messenger, and Instagram, which are all owned by the same company.
The issue seems to have spread worldwide with users across the US, India, Europe, and Asia taking to Twitter to raise the issue.
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Another posted: "When you can't tell if WhatsApp is down because nobody is texting you".
Every week, the most popular apps and social media platforms get updated.
Facebook, Whatsapp and Instagram are all suffering technical difficulties.
This story is developing...