Inter and AC Milan share a stadium mainly for historical, financial, and logistical reasons: San Siro (Giuseppe Meazza) became the most practical big venue in Milan, so both clubs ended up co‑tenants to save costs and use the same central, iconic ground.

Quick Scoop: Why they share

  • Inter originally played at the smaller, old Arena Civica, while AC Milan were already at San Siro, which opened in 1926 and quickly became the city’s major football venue.
  • In 1947, Inter moved in and became joint tenants because San Siro was larger, more modern, and better suited to a big club than Arena Civica.
  • Sharing one huge stadium in a central, well‑connected part of Milan lets both clubs cut renovation, maintenance, and matchday costs instead of each funding a separate 70–80k arena.

A bit of history

  • San Siro was originally AC Milan’s home; the stadium later passed to the Municipality of Milan in 1935, which then rented it out, making it easier for both clubs to cohabit as tenants rather than owners.
  • After World War II, the move to share was largely out of necessity : there was no realistic alternative large stadium in the city, and building another one from scratch was not viable at the time.

How the ground share works

  • The official name is Stadio Giuseppe Meazza, but Milan fans usually say “San Siro”, while Inter fans more readily use “Meazza”, reflecting their different traditions and heroes.
  • The stadium has separate dressing rooms for each club, and league scheduling ensures they never both play “at home” on the same day; they alternate home weekends through the season.

Money, logistics, and Italian context

  • Sharing lets both teams split big‑ticket expenses like structural work, safety upgrades, and general upkeep, which is a major saving compared with single‑club stadiums of similar size.
  • Stadium sharing is quite normal in Italy: Roma and Lazio both use the Stadio Olimpico, while Genoa and Sampdoria share the Stadio Luigi Ferraris, all for similar financial and logistical reasons.

Latest news and what’s next

  • Both clubs have explored leaving San Siro for separate, modern arenas (Inter eyeing Rozzano, Milan looking at San Donato) because the current ground struggles to meet modern commercial and tournament standards.
  • Political, cost, and planning issues have repeatedly slowed or reshaped these projects, and there have even been reports and debates about building a new shared stadium again instead of fully going solo.

Bottom line: they share San Siro because it became the biggest, best‑located option in Milan, and splitting one massive stadium has long been cheaper and more practical than each club having its own.

Information gathered from public forums or data available on the internet and portrayed here.