A Pillow Case of Mystery is a 2006 Hong Kong detective-fantasy television drama starring Bobby Au-yeung as the title character, Mr. Sze. Produced by Lam Chi-wah and edited by Lau Chi-wah, the drama is a TVB production. The original broadcast was on the TVB Jade network with 45-minute episodes airing five days a week from 31 January to 26 February 2006. The drama is set during the early 19th century Qing dynasty. Sze Sai-lun, the newly appointed magistrate of Kong-do County, accidentally encounters a spirit, enclosed in a magic pillow, who helps him solve cases.

A Pillow Case of Mystery II is a 2010 Hong Kong detective-fantasy television drama starring Bobby Au-yeung as the title character, Mr. Sze.