Use this format when you need to request leave for illness — whether you're writing to a manager at work or a class teacher/principal at school. Just swap in your own details.
To,
The Manager,
[Company Name],
[Company Address]
Date: [DD/MM/YYYY]
Subject: Application for Sick Leave
Dear [Manager's Name],
I am writing to inform you that I am unwell and unable to attend office from [Start Date] to [End Date]. I am suffering from [brief reason, e.g. fever, viral infection] and have been advised rest by my doctor.
I have completed/handed over my pending work to [Colleague's Name, if applicable] and will resume duty on [Return Date]. Kindly grant me leave for the above period.
Thank you for your understanding.
Sincerely,
[Your Name]
[Employee ID, if applicable]
Tips
- Keep it short — 3-4 sentences is enough, you don't need to over-explain your illness.
- Mention the exact dates clearly so there's no confusion about your return.
- If you have a medical certificate, mention that you'll attach or submit it separately.
- For a school leave letter, replace 'Manager' with 'Class Teacher' or 'Principal' and adjust the tone slightly to be more formal.