Hemiarius is a genus of sea catfishes found in the coastal waters, estuaries, and rivers from South Asia through New Guinea and Australia to Oceania. Six described species are in this genus:

• Hemiarius bleekeri (Popta, 1900) (Bleeker's catfish)
• Hemiarius hardenbergi (Kailola, 2000)
• Hemiarius harmandi Sauvage, 1880
• Hemiarius stormii (Bleeker, 1858) (armoured sea-catfish)
• Hemiarius sumatranus (Anonymous, referred to E. T. Bennett, 1830) (goat catfish)
• Hemiarius verrucosus (H. H. Ng, 2003) (shovelnose sea catfish)

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