An epistolary novel is a novel written in the form of letters exchanged between characters.

The Love Letters of Abelard and Heloise is a collection of letters exchanged between the medieval philosopher Peter Abelard and his student Heloise.

Pamela, or Virtue Rewarded is an epistolary novel by Samuel Richardson, first published in 1740.

In (\text{Pride and Prejudice}), Mr. Darcy writes passionate love letters to Elizabeth Bennet, expressing his deep admiration and love for her.

The Love Letters of Napoleon and Josephine is a collection of letters exchanged between Napoleon Bonaparte and his wife Josephine.

Sonnets from the Portuguese is a collection of 44 sonnets written by Elizabeth Barrett Browning to her future husband Robert Browning.

A Time to Love and a Time to Die is a novel by Erich Maria Remarque, written in the form of love letters from a young soldier to his beloved.

In (\text{Love Actually}), Mark writes a series of love letters to Juliet, the wife of his best friend Peter.

Me Before You is a novel by Jojo Moyes that tells the story of a young woman who falls in love with a quadriplegic man through their exchanged letters.

In (\text{Dear Evan Hansen}), the song (\text{Sincerely, Me}) features Evan Hansen writing a love letter to Zoe Murphy.

Louis XV is known for writing passionate love letters to his mistress, Madame de Pompadour.

In (\text{The Big Bang Theory}), Leonard writes a series of love letters to Penny.

The Canzoniere is a collection of love sonnets written by Petrarch to his beloved Laura.

In (\text{The Fault in Our Stars}), Augustus Waters writes a series of love letters to Hazel Grace Lancaster.

Paper Towns is a novel by John Green that tells the story of two teenagers who fall in love through their exchanged emails.