Terrestrial

Italy is in the Palearctic realm Ecoregions are listed by biome.

Temperate coniferous forests

• Alps conifer and mixed forests

Temperate broadleaf and mixed forests

• Po Basin mixed forests
• Apennine deciduous montane forests
• Dinaric Mountains mixed forests

Mediterranean forests, woodlands, and shrub

• Italian sclerophyllous and semi-deciduous forests
• South Apennine mixed montane forests
• Tyrrhenian-Adriatic sclerophyllous and mixed forests
• Northeastern Spain and Southern France Mediterranean forests
• Illyrian deciduous forests

Freshwater

• Gulf of Venice Drainages
• Italian Peninsula & Islands

Marine

Italy's territorial waters are in the Temperate Northern Atlantic marine realm, and Mediterranean Sea marine province.

• Adriatic Sea
• Ionian Sea
• Western Mediterranean