Ditylum is a genus of diatoms belonging to the family Lithodesmiaceae.

The genus has cosmopolitan distribution.

Species:

• Ditylum brightwellii (T.West) Grunow, 1885
• Ditylum buchananii von Stosch, 1987
• Ditylum cornutum Forti & Schulz, 1932
• Ditylum ehrenbergii Grunow, 1883
• Ditylum grovei Brun, 1891
• Ditylum inaequale J.W.Bailey ex L.W.Bailey, 1862
• Ditylum pernodi Schröder, 1906
• Ditylum segmentale Brun, 1891
• Ditylum sol (Grunow) De Toni, 1894
• Ditylum trigonum L.W.Bailey ex L.W.Bailey, 1862
• Ditylum trigonum Schröder, 1906

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