The River Tiddy (Cornish: Teudhi)[1] is a small river in south-east Cornwall, England, United Kingdom.

The Tiddy rises near Pensilva and flows south east past the village of Tideford until it joins the Lynher just after passing St Germans.

St Germans is a historic fishing village situated on the Tiddy just upstream of its confluence with the Lynher.

The Tiddy and Lynher rivers are alternatively called St Germans River downstream of St Germans.

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