John Pitcairn Jr. (1841-1916) was an American industrialist and philanthropist known for his contributions to the glass industry. He played a significant role in the development of the Pittsburgh Plate Glass Company, which became one of the largest glass manufacturers in the United States. His leadership helped the company expand its operations and innovate in glass production techniques. In addition to his business achievements, Pitcairn was also involved in various charitable activities. He supported educational initiatives and contributed to the establishment of the Pitcairn School District in Pennsylvania. His legacy includes both his industrial impact and his commitment to community development.