Olenellina is a suborder of the order Redlichiida of trilobites that occurs about halfway during the Lower Cambrian, at the start of the stage called the Atdabanian.

A feature uniting the Olenellina is the lack of rupture lines (or sutures) in the headshield, which in other trilobites assist the periodic moulting (or ecdysis), associated with arthropod growth.

Lieberman, 2002, considered that the Fallotaspidoidea are a paraphyletic group because it gave rise to the Redlichiina; he did not propose to restrict the Olenellina to the Olenelloidea, Judomioidea and Nevadioidea.

The Olenellina probably first occurred on the paleocontinent Siberia and spread into the part of Gondwana that is now the Atlas Mountains, Baltica, Avalonia and Laurentia.

[5] The Olenellina are not known from South China, Australia and most of Latin America and Africa, where the first trilobites were Redlichiina, that had already developed dorsal sutures.