Apology Letter for Being Tardy

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Dear {Mr./Mrs./Professor Last Name},

I am terribly sorry that I was tardy for {name of class or lecture}. I understand that your time is valuable, as is that of my fellow students, and that {class or lecture} begins at a certain time for a reason.

My time is not more important than anyone else's, so it was inexcusable for me to come in late and disrupt {class or lecture} in the manner in which I did.

Again, I am very sorry for what I did. I hope you know this will not happen again.

Sincerely,

{Sender}