Some are great films, some are just beautiful shots of Italy in mediocre attempts at filmmaking.
Tuscany
Under the Tuscan Sun
Much Ado About Nothing
Stealing Beauty
Tea with Mussolini (San Gimignano)
English Patient (southern Tuscany)
A Room with a View
Up at the Villa
Hannibal
Life is Beautiful
Quantum of Solace
The Last Victory
The Best of Youth (and elsewhere)
Light in the Piazza
The Affairs of Cellini
Virgin Territory (based on the Decameron)
Letters to Juliet
Portrait of a Lady
Prince of Foxes
Where Angels Fear to Tread
The Triumph of Love
The Night of the Shooting Stars
Obsession
The Gladiator
Romeo and Juliet (1968)
New Moon
Venice
Bread and Tulips
Dangerous Beauty
The Italian Job (2003)
It Started in Naples
Casino Royale
The Tourist
Everyone Says I Love You
From Russia with Love
Indiana Jones and the Last Crusade
Moonraker
Vampire in Venice
Death in Venice
Brideshead Revisited
Don't Look Now
Summertime
Sicily
Cinema Paradiso
I Cento Passi
Malena
The Godfather Part III
Mighty Aphrodite (opening)
Stanno Tutti Bene (later elsewhere in Italy)
Rome
Three Coins in a Fountain
Roman Holiday
La Dolce Vita
Angels and Demons
The Bicycle Thieves
Caterina in the Big City
Besieged
The Secret of Santa Vittaria (Anticoli Corrado)
Eat Pray Love
The Beaches or Lakes
Enchanted April (Ligurian coast)
The Talented Mr. Ripley (Ischia)
Il Postino (Naples, Bay of Naples, Sicily)
Star Wars Episode II: Attack of the Clones (Lake Como)
A Month by the Lake (Como)
Respiro
Caro Diario (Aeolian Islands and Rome)
Matera (a unique locale)
The Passion of the Christ
Christ Stopped at Eboli
Other or I'm Not Sure Where These Were Shot!
Agata and the Storm
My House in Umbria
The Name of the Rose
Ciao Professore (Naples)
Novecento (Parma)