Ernst Bernhard Lohrmann (30 June 1803 — 17 June 1870)^[1] was a German-Finnish architect born and educated in Germany but practising mainly in the Grand Duchy of Finland, where he is known especially as a designer of public buildings and more than 20 churches, many in the late Empire and Gothic Revival styles.^[2]

Lohrmann also held the position of Intendant of the National Board of Public Building, following the death in 1840 of his predecessor and compatriot Carl Ludvig Engel.^[2][1] In that role, Lohrmann is credited with considerably developing and systematising the Board's operations, as well as seeing through to completion many of Engel's unfinished designs.^[1]

Notable examples of buildings designed by Lohrmann include:

• St. Henry's Cathedral, Helsinki
• Mint of Finland, Helsinki
• Kuopio Governor Palace (original plans, not built)
• Utsjoki Church
• Ruokolahti Church
• Söderskär Lighthouse, Porvoo
• Old Turku Prison ('Kakola')
• Villa Hakasalmi, Helsinki
• Kristinestad City Hall
• Pielisjoki Castle, Joensuu