La Roche-Jaudy (French pronunciation: [la ʁɔʃ ʒodi]; Breton: Roc'h-ar-Yeodi) is a commune in the Côtes-d'Armor department of Brittany in northwestern France.

It was established on 1 January 2019 by merger of the former communes of La Roche-Derrien (the seat), Hengoat, Pommerit-Jaudy and Pouldouran.

The average annual temperature in La Roche-Jaudy is 11.7 °C (53.1 °F).

The average annual rainfall is 891.0 mm (35.08 in) with December as the wettest month.

The temperatures are highest on average in August, at around 17.6 °C (63.7 °F), and lowest in January, at around 6.8 °C (44.2 °F).