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Heather O’Neill fan mail address

To send fan mail to Heather O’Neill, mail your letter to Heather O’Neill, c/o HarperCollins, 22 Adelaide St W, 41st Floor, Toronto, ON M5H 4E3. Heather O’Neill is a novelist — author of Lullabies for Little Criminals, The Lonely Hearts Hotel, and When We Lost Our Heads. Letters reach Heather O’Neill through HarperCollins, Heather O’Neill's imprint at HarperCollins Canada, which forwards reader mail to its authors — never a private home. Authors do change publishers, so confirm Heather O’Neill is still with HarperCollins before sending. Don't enclose cash, gifts, or books to be signed, and add your return address if you're hoping for a reply.

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Mailing address

Verified September 2026

Heather O’Neill — fan mail address

Heather O’Neill
c/o HarperCollins
22 Adelaide St W, 41st Floor
Toronto ON  M5H 4E3
Canada

Fan mail and letters. This goes to HarperCollins, Heather O’Neill's imprint at HarperCollins Canada, which forwards reader mail to its authors — not a home address. Authors do change publishers, so confirm Heather O’Neill is still published by HarperCollins before sending.

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No printer, envelope, or stamp — we print and mail it the next business day.

Sources

Addresses verified September 2026 against official sources. Always confirm on the official site before time-sensitive filings.

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Key facts

  • Letters go c/o HarperCollins at HarperCollins Canada — a public office that forwards reader mail, never a home address.
  • Heather O’Neill is a novelist: author of Lullabies for Little Criminals, The Lonely Hearts Hotel, and When We Lost Our Heads.
  • Authors change publishers; confirm Heather O’Neill is still published by HarperCollins before mailing.
  • A personal reply or signed bookplate is never guaranteed — include your return address to improve the odds.
  • Send letters only: publishers ask you not to send books to sign, gifts, or cash, and can’t forward parcels.
  • PostPal prints your letter and mails it for you — no printer, envelope, stamps, or post office trip.

How to send your letter

  1. 1

    Confirm who publishes them now

    Authors move between publishers, so before you send, check that Heather O’Neill is still published by HarperCollins (part of HarperCollins Canada) — see the sources below. If they've moved, address your letter to the new publisher instead. Some authors also list a preferred contact or agent on their own website.

  2. 2

    Write your letter

    Keep it to paper. Publishers forward reader mail but won't pass on cash, gifts, or valuables, and most ask you not to send books or items to be signed. Add your return address if you'd like a chance at a reply, though a personal response is never guaranteed.

  3. 3

    Address it c/o HarperCollins

    First line: Heather O’Neill. Next line: c/o HarperCollins. Then the publisher's address: 22 Adelaide St W, 41st Floor, Toronto ON M5H 4E3. That building is HarperCollins Canada's office, which routes the letter to Heather O’Neill at HarperCollins.

  4. 4

    Send it from anywhere with PostPal

    Write or upload your letter to PostPal with the address above prefilled. We print it, add your return address, and mail it for you — no printer, envelope, stamps, or trip to the post office.

Common questions

What is Heather O’Neill's fan mail address?

Heather O’Neill, c/o HarperCollins, 22 Adelaide St W, 41st Floor, Toronto, ON M5H 4E3. Letters go to HarperCollins, Heather O’Neill's imprint at HarperCollins Canada, which forwards reader mail to its authors — not a home address. Confirm Heather O’Neill is still published by HarperCollins before mailing.

Will Heather O’Neill read my letter or write back?

Maybe. Publishers pass reader mail to their authors, but best-selling writers receive far more than they can personally answer. Include your return address to give yourself the best shot at a reply or a signed bookplate, but treat a personal response as a bonus, not a guarantee.

Is this Heather O’Neill's home address?

No. This is the public head office of their publisher, HarperCollins Canada. We never publish authors' private home addresses — mailing someone's home would not be okay. Routing fan mail through the publisher is the standard, expected way to write to an author.

Can I send Heather O’Neill a book to sign or a gift?

Better not to. HarperCollins Canada — like most publishers — asks readers not to send books, photos, or items to be signed, and can't forward parcels, gifts, or cash. A letter is the surer bet; PostPal sends letters and printed documents, not packages.

How do I mail Heather O’Neill a letter without a printer?

Write or upload your letter to PostPal with the address prefilled. We print it, add your return address, and mail it for you — no printer, stamps, or post office trip needed.

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