Writers pause over this one more than you'd expect. Is it my apologies or my apology? Both forms are real English, both appear in professional emails every day, and neither is inherently wrong. The difference comes down to what you're actually expressing and where the phrase sits in your sentence.
What "my apologies" means
"My apologies" is a set phrase used to express regret, most often as a standalone acknowledgment. It functions like a social gesture. When you write "My apologies for the delay," you're offering an expression of regret, the same way you'd say "my thanks" or "my regards." The plural form has been conventional in this role for centuries, probably because it implies the sentiment is sincere and complete, rather than a single token gesture.
Use "my apologies" at the start of a message, at the start of a reply, or wherever you'd naturally say "sorry" in a professional tone. It fits email openers perfectly. It works in letters, formal memos, and client-facing documents. Most business writers reach for this form automatically, and in most contexts, it's the right call.
A few typical uses:
- "My apologies for the late reply."
- "My apologies. The report will be with you by noon."
- "Please accept my apologies for any inconvenience."
What "my apology" means
"My apology" is the singular noun form. It refers to a specific act of apologizing, as a countable thing. You'd use it when you're talking about an apology rather than offering one. The distinction is subtle but real.
Consider: "I hope my apology was sufficient" or "My apology was rejected." Both treat the apology as a discrete object. That's the singular form doing its proper job. You wouldn't swap in "my apologies" in either sentence without making it sound slightly odd.
The singular also appears in constructions like "Please accept my apology," which sounds slightly more formal and deliberate than the plural version. Some style guides prefer this in very formal letters, particularly legal or diplomatic correspondence, because the singular emphasizes the weight of a single, considered act of contrition rather than a general expression of regret.
How to choose between them in practice
The simplest test: are you expressing regret, or referring to an apology as a thing? If you're expressing regret, use "my apologies." If you're referencing the apology itself as a noun, use "my apology."
In day-to-day professional writing, "my apologies" wins almost every time. It's warmer, less stiff, and reads as the natural choice in an email. "My apology" is more common in formal written contexts where the apology is being discussed, submitted, or reviewed as a distinct act. Think legal settlement letters, formal grievance responses, or written apologies that serve as official records.
One thing that doesn't work: writing "my apologies" when you need the singular noun to function grammatically. "I owe you my apologies" sounds fine as an idiom, but "my apologies was brief" is a grammatical error, because the plural subject doesn't match the singular verb. In sentences where the apology is the subject, use the singular and match your verb accordingly.
Common mistakes to avoid
"Apologies" is sometimes written with unintended baggage. When it comes at the start of a message, it can read as perfunctory if the rest of the email doesn't back it up with a genuine correction or fix. Just like thank you for your understanding, "my apologies" can land badly if it substitutes for actually addressing the problem. Lead with the fix, then offer the apology, and you'll almost always come across better.
Writers also sometimes confuse "apologies" with the verb "apologize." "I apologies" is not a valid construction. The verb form is "I apologize" (British: "I apologise"). If you need a verb, use "apologize." If you need a noun phrase, use "my apology" or "my apologies" depending on the grammar of the sentence.
One more thing worth knowing: "my sincerest apologies" is grammatically fine but often adds little. "Sincerest" is the kind of intensifier that sounds more sincere in theory than it reads in practice. A plain "my apologies" followed by a clear explanation of what went wrong and how you're fixing it will always read as more genuine. For more on how professional politeness phrases can work against you, the problem with "not a problem" as a reply covers the same pattern in a different context.
Quick reference
Use "my apologies" when you're expressing regret in real time, opening an email, or using the phrase as a social gesture. It's the right choice in the vast majority of professional situations.
Use "my apology" when the apology functions as a noun in a sentence, when you're referring to a specific act of apologizing, or when the formal register of your document calls for more deliberate phrasing.
Both forms are correct. Neither is a grammar error. The real question is always whether the phrase is doing useful work in the sentence or just filling space where a more direct acknowledgment and a concrete fix belong.