Jacob Jørgen Kastrup Sømme (9 January 1817 – 21 October 1893) was a Norwegian businessman, consul and politician.
He was born in Stavanger to merchant and captain Andreas Sømme (1788–1853) and his wife Johanne Cathrine Kastrup (1789–June 1817).
Their most prominent child was painter Jacob Kielland Sømme.
A ship-owner, Sømme especially concentrated on fishing and exporting atlantic herring.
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