Taishi may refer to:
Names Taishi (surname), Chinese family name Taishi (given name), Japanese given name
Ranks Grand Preceptor, ancient Chinese top civilian position: taishi () in Chinese Taishi, an alternate name of the Japanese Daijō-daijin Taishi (Mongol title), a rank of Mongolian nobility
Places Taishi Town (太石镇), town in Lintao County, Gansu, China Taishi Township (太石乡), township in Kang County, Gansu, China Taishi, Guangzhou, village in Guangdong, China Taishi, Hyōgo, town in Hyōgo, Japan Taishi, Osaka, town in Osaka, Japan Taisi, Yunlin, also known as Taishi, township in Yunlin County, Taiwan
Historical eras Taishi (太始, 96BC–93BC), an era name used by Emperor Wu of Han Taishi (泰始, 265–274), an era name used by Emperor Wu of Jin Taishi (泰始, 465–471), an era name used by Emperor Ming of Liu Song Taishi (太始, 551–552), an era name used by Hou Jing Taishi (太始, 818), or Taesi, an era name used by Gan of Balhae