The Tallow Horse Fair (Irish: Aonach Capall Tulach an Iarainn) is a horse fair which takes place annually in Tallow, County Waterford, Ireland.

[3] Held every year since 1904, it occurs on the 3 September, unless it falls on a weekend, in which case it takes place on the following Monday.

It is considered the 'unofficial holiday' of Tallow, with traffic through the town being restricted for the duration of the fair.

Like other horse fairs in Ireland, it is frequented by Travellers.

[6] The Horse Fair was cancelled in 2020 and 2021 due to restrictions imposed during the COVID-19 pandemic, returning in 2022.