When writing an apology letter for a mistake at work, it's important to acknowledge the error, express regret, and assure the recipient that it won't happen again. Being clear, polite, and taking responsibility for the mistake can help rebuild trust and maintain a positive professional relationship.
Sample Apology Letter to HR Manager for Work Mistake
To,
The HR Manager,
___________ (Name of the company),
___________ (Company’s address)
Date: __/__/_____ (Date)
Subject: Apology for mistake done
Respected Sir/ Madam,
I__________ (Name), working in __________ (department) of your reputed company as a __________ (designation).
I write this letter to bring into your kind consideration the mistake that I made while ___________ (mention situation). I feel sorry for sending the _______________ (incorrect documents/ documents with incorrect details/ any other) to ____________ (mention name). This happened due to my ignorance and accept that such negligence shall not be tolerated by the administration.
I ensure that, you will not have to face such a negligence again in the future. I feel sorry for the same and request you to kindly provide me with another chance in this regard. I shall be highly obliged.
Thanking you,
____________ (signature),
____________ (name),
____________ (contact number)
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Sandeep Bhandari 
Deepanshu Thakral