Ernst Seifert (9 May 1855 – 27 April 1928) was a German organ builder and founder of a company named after him.

In 1885 he founded his company in Cologne-Mannsfeld.^[1]

Organs by Seifert are found in the following churches:

• 1898 St. Gereon's Basilica, Cologne
• 1903 Christus-Church, Mönchengladbach,
• 1907 Kevelaer Basilica
• 1907 Quirinus Münster, Neuss
• 1909 St. Peter's Church, Kettwig
• 1912 Alternberg Cathedral, Altenberg
• 1912 St. Matthias Church, Cologne-Bayenthal