Eurasian Siskin, Carduelis spinus, is a species of passerine bird in the finch family found in woodland and forest ecosystems. It is a widespread breeder across most of Europe. This species breeds in boreal and temperate lowland, submontane and montane conifer forests, mainly spruce (Picea), and in fairly open mixed deciduous and conifer forests, including fir (Abies) and pine (Pinus). It also frequents a wide variety of other trees, including larch (Larix), alder (Alnus) and birch (Betula), together with non-native conifers in plantations, parks and gardens (European Red List 2015).

Carduelis spinus has a breeding population size of 3480000-5460000 pairs and a breeding range size of 1750000 square kilometres in the EU27. The breeding population trend in the EU27 is Decreasing in the short term and Increasing in the long term.

The EU population status of Carduelis spinus was assessed as Secure, because the species does not meet any of the IUCN Red List criteria for threatened or Near Threatened, or the criteria for Depleted or Declining (the EU27 population or range has not declined by 20% or more since 1980).