Tuathal (Old Irish: Túathal) is an Irish male name meaning [ruling with] 'fervour over the people' or 'valour of the tribe', from Old Irish túath 'people, tribe, tribal territory' + gal 'ardour, valour', from Proto-Celtic *galā 'might, ability'.

tuathal is also the Modern Irish for movement anticlockwise or widdershins, from the Old Irish túath 'left, north' + sel 'turn', from a different Proto-Celtic root not meaning 'people, tribe', see there, sense 2 for details.

People with the name include:

The surname O'Toole is an anglicisation of Ó Tuathail (Old Irish: Ua Túathail), meaning grandson or descendant of Túathal. One instance is the O'Toole family prominent in medieval Wicklow, who claimed descent from Tuathal Mac Augaire.

Placenames associated with the name include:

See also

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