A cat who has been a fixture for years in the window of a Buddhist temple in Chinatown has mysteriously disappeared, prompting worry and prayers from hundreds of devoted fans.

And now the temple’s monk is offering a $200 reward for Do-Do’s safe return to the Guan-Gong Temple at 294 Broome St.

“We had it eight years. We are very worried, Do-Do has many fans. Many people are worried!” Tanzin Zangpo told The Post yesterday.

Do-Do usually sat Buddha-like in a window, drawing neighbors, tourists — and even dogs.

“He is a very smart cat,” the monk said, noting how Do-Do would sit and watch barking dogs until their owners pulled them away.

It’s unclear how he escaped last week, though he would often also sit outside or visit a neighboring shop.

“We just hope someone finds him,” said Zangpo, who plastered the neighborhood with pictures of the feline.