-
- Kern, R.G.
Country City Dusseldorf & Frankfurt
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- Kerr, Alexander
Country City Williamsburg VA
Era e.1737
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- Kirkpatrick, T. & Co.
Country City New York NY
Era e.1857-c.1980s
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- Kittelsen, Grete Prytz
Country City Oslo
Era (1917 -2010)
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- Knox, Archibald
Country City Isle of Man, London
Era (1864-1933)
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- Lacaze, René Sim
Country City Paris
Era (1901 – 2000)
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- Lancraft Mfg. Jewelers
Country City New York NY
Era c.1950
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- Larsen and Lewers
Country Era e.c.1960s
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- Lawrence Mfg. Inc.
Country City Providence RI
Era c.1950
-
- Laykin et Cie
Country City Los Angeles CA
Era c.1920s
-
- Le Sache, Georges
Country City Paris
Era 1849
-
- Le Turcq et Duval
Country City Paris
Era e.1885-1894
-
-
- Lie-Jørgensen, Thorbjørn
Country City Oslo
Era (1900 -1961)
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- Lohmann-Gruber, Margarete
Country City Saarbrücken
Era e.1936
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- Longines
Country City Saint-Imier
Era e.1832
