Diancistrus is een geslacht van straalvinnige vissen uit de familie van naaldvissen (Bythitidae).

Soorten 
 Diancistrus alatus Cohen, 1966
 Diancistrus alleni Schwarzhans, Møller & Nielsen, 2005
 Diancistrus altidorsalis Schwarzhans, Møller & Nielsen, 2005
 Diancistrus atollorum Schwarzhans, Møller & Nielsen, 2005
 Diancistrus beateae Schwarzhans, Møller & Nielsen, 2005
 Diancistrus brevirostris Schwarzhans, Møller & Nielsen, 2005
 Diancistrus eremitus Schwarzhans, Møller & Nielsen, 2005
 Diancistrus erythraeus (Fowler, 1946)
 Diancistrus fijiensis Schwarzhans, Møller & Nielsen, 2005
 Diancistrus fuscus (Fowler, 1946)
 Diancistrus jackrandalli Schwarzhans, Møller & Nielsen, 2005
 Diancistrus jeffjohnsoni Schwarzhans, Møller & Nielsen, 2005
 Diancistrus karinae Schwarzhans, Møller & Nielsen, 2005
 Diancistrus katrineae Schwarzhans, Møller & Nielsen, 2005
 Diancistrus leisi Schwarzhans, Møller & Nielsen, 2005
 Diancistrus longifilis Ogilby, 1899
 Diancistrus machidai Schwarzhans, Møller & Nielsen, 2005
 Diancistrus manciporus Schwarzhans, Møller & Nielsen, 2005
 Diancistrus mcgroutheri Schwarzhans, Møller & Nielsen, 2005
 Diancistrus mennei Schwarzhans, Møller & Nielsen, 2005
 Diancistrus niger Schwarzhans, Møller & Nielsen, 2005
 Diancistrus novaeguineae (Machida, 1996)
 Diancistrus pohnpeiensis Schwarzhans, Møller & Nielsen, 2005
 Diancistrus robustus Schwarzhans, Møller & Nielsen, 2005
 Diancistrus springeri Schwarzhans, Møller & Nielsen, 2005
 Diancistrus tongaensis Schwarzhans, Møller & Nielsen, 2005
 Diancistrus typhlops Nielsen, Schwarzhans & Hadiaty, 2009
 Diancistrus vietnamensis Schwarzhans, Møller & Nielsen, 2005

Bythitidae