Dr. H. Oidtmann GmbH is a Gesellschaft mit beschränkter Haftung based in Linnich, Germany.

The business first started as a sideline for the doctor, due to his inspiration derived from glass slides, but later grew.

[3][4][5] The workshops were significantly damaged during World War II and had to be rebuilt during the management of Friedrich and Ludovikus Oidtmann.

Among these works were the stained glass windows of the Saint Marien in Koln-Kalk by Georg Meistermann and stained glass work at Ōmiya Station in Saitama, Japan by Ludwig Schaffrath.

[4][6] The Oidtmann workshop also fabricated the stained glass windows at the San Sebastian Church in Manila, Philippines in 1889.