Date 4th Apr 2026 Time ... World Rat Day World Rat Day is observed annually on April 4th. It’s an unofficial celebration dedicated to fancy rats who are among the most popular pets. The holiday was created in 2002. Labels -YEARLY- Tags: world rat day, world rat day 2023, world rat day 2024, world rat day 2024 theme, world rat day 2025, world rat day book, world rat day date, world rat day images, world rat day wikipedia, worldwide rat day