Melanoliarus is a genus of cixiid planthoppers in the family Cixiidae. There are at about 50 described species in Melanoliarus, which are common and widespread in the Nearctic and Neotropics.

The genus Melanoliarus was originally described as a subgenus of Oliarus, which had worldwide distribution. It was determined in 2001 and 2002 that species of Oliarus in the new world belonged in Melanoliarus, which was elevated to genus rank and included most of the new world species of Oliarus.

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