Astellas Pharma Inc. is a Japan-based company mainly engaged in the pharmaceuticals and related products business.

The company operates in two business segments.
- The Pharmaceuticals and Related Products segment is engaged in the development, manufacture and sale of its pharmaceuticals to both domestic and overseas markets including Japan, North America, Europe and Asia.
- The Others segment is engaged in the real estate business.

In July 2010, the company established a subsidiary in Brazil.