Sincybaeus is a genus of spiders in the family Cybaeidae.

Distribution Three of the described species are endemic to Japan, with one endemic to Liaoning, China.

Etymology The genus name is a combination of "Sin-" "China" and Cybaeus. The non-Chinese species were added to this genus in 2024.

S. liaoning is named after the type locality.

Species , this genus includes four species:

Sincybaeus liaoning Wang & Zhang, 2022 – China (type species) Sincybaeus monticola (Kobayashi, 2006) – Japan Sincybaeus rarispinosus (Yaginuma, 1970) – Japan Sincybaeus yoshiakii (Yaginuma, 1968) – Japan

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