Taisho Pharmaceutical Co., Ltd. is a Japanese pharmaceutical company based in Tokyo.

The company's principal line of business is over-the-counter (OTC) medicines, where it markets the brands Lipovitan-D, Pabron, Colac, Contac, Tempra, UPSA, Vicks and Kampo In prescription pharmaceuticals, the company's most successful product to date has been the macrolide antibiotic clarithromycin.

The company's branded version of the drug, Clarith, was launched in Japan in 1991. For clarithromycin distribution outside Japan Taisho licensed clarithromycin to Abbott Laboratories.