Bush wrote the song aged 18, inspired after seeing an adaptation of the 1847 novel Wuthering Heights by Emily Bronte.
The lyrics are attributed to the novel's character Catherine Earnshaw, pleading at the window of Heathcliff, the man she loves, to be let in. Bush had recorded it in 1978 dressed in red and it was her most successful single.
Hundreds of fans gathered in Berlin's central Goerlitzer Park under light rain, recreating Bush's moves for a performance lasting about four minutes, an AFP photographer said.
Earlier, about 100 men, women and children in Sydney also staged a similar dance in a city park. Other flash mobs are scheduled in Sydney, Dublin and the Netherlands.
The “Wuthering Heights Day” was launched in Berlin a few years ago and has spread to other cities.