When writing an apology letter to HR for a mistake at work, it's important to be clear, polite, and take responsibility for the error. Begin by addressing the HR Manager respectfully. Clearly state your name, department, and employee ID. Describe the mistake concisely, acknowledging the negligence or ignorance that led to it. Apologize sincerely and assure the recipient that you will not repeat the mistake. Provide contact information for further communication.
Sample Apology Letter for the Mistake Done
To,
The HR Manager,
_________ (Company’s Name)
_________ (Address of the company)
Date: __/__/_____ (Date)
Subject: Apology for the mistake done
Sir/ Madam,
I write this letter to apologize for the mistake I have done at work. My name is _________ (name) and I have been working in _________ (department) of your company. My employee ID is _________ (mention your employee ID).
Respected, I apologize to inform you that __________ (mention what happened). All this happened due to the negligence and ignorance and was totally unintentional. This is to inform that on __/__/____ (date), I _________ (mention your point).
I assure you that I won’t be repeating such negligence, and it is to request you to kindly accept my sincere apologies.
For any queries, you may contact me at __________ (mention contact number).
Regards,
__________ (Signature),
__________ (Your name),
__________ (Contact details)
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Sandeep Bhandari 
Deepanshu Thakral