The Eurasian wren has a disjunct distribution between Asia and Europe (BirdLife International, 2024). In Europe, it occupies the entire continent except for the coldest areas north of Fennoscandia (Keller et al., 2020). In Spain, it is distributed continuously across the northern half of the Iberian Peninsula, except in deforested areas of the Ebro Valley and the northern Meseta. In the southern half, its distribution is more fragmented, occurring continuously only in the mountain systems of Sierra Morena and the Baetic Range (Justo Álvarez and Torralvo Moreno in SEO/BirdLife, 2022). It breeds in the Balearic Islands and Ceuta, but is absent from the Canary Islands and Melilla.

In Madrid, it occupies the entire mountain range and piedmont belt, extending into the southeastern half via riparian woodlands. It prefers forested environments, especially cool habitats such as ash groves, Scots pine forests, and oak woods. It can also be found in riparian stands and gardens, provided there is abundant shrub cover, and it is not uncommon in high-mountain shrublands such as broom and heather thickets (Díaz et al., 1994).

In the national park it is very widely distributed, with notable presence in the central and southern areas of the protected space, as well as on the slopes and high zones of the northern sector, where it finds suitable breeding habitats in forest stands and in high-mountain shrublands dominated by broom.