Orgelbau Klais is a German firm that designs, builds and restores pipe organs.

[1] Johannes Klais, a skilled organ builder trained in Alsace, Switzerland, and Southern Germany, established his own workshop in Bonn in 1882.

However, even before the turn of the century, he demonstrated innovation by creating high-pressure stops with dual mouths on pneumatic cone valve chests.

The company gained international recognition for its restoration of the historic Bamboo Organ at St. Joseph's Parish in Las Piñas City, Philippines.

Klais also restored other organs in the cathedral and added a detached console that operates all of them at once.