Bymainiella is a genus of Australian funnel-web spiders that was first described by R. J. Raven in 1978. This genus is named in honour of the Australian arachnologist Barbara York Main.

Species it contains four species: Bymainiella lugubris Raven, 1978 – Australia (New South Wales) Bymainiella monteithi Raven, 1978 – Australia (Queensland, New South Wales) Bymainiella polesoni Raven, 1978 – Australia (New South Wales) Bymainiella terraereginae (Raven, 1976) (type) – Australia (Queensland, New South Wales)

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