Official Letter vs Office Memorandum vs Circular: What to Use (India)

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Quick answer

An official letter is typically used for formal communication to a specific recipient or external office. An Office Memorandum (OM) is commonly used for internal circulation within an organisation or department and often includes a distribution list. A circular is used to communicate information or instructions to a wider group, often across multiple units. Exact usage varies by office manuals and jurisdiction, so treat these as common practice and verify organisation-specific rules when needed.

Introduction

Choosing the right document type reduces delays and prevents misrouting. This page explains the common differences between:

Official letters
Office Memorandums (OMs)
Circulars

Note: This is based on common administrative practice. If your organisation has a prescribed document type for a situation, follow it.

When to Use

Use an official letter when

writing to a specific officer/office
communicating externally (another department/institution)
submitting a request or representation requiring a formal record

Use an office memorandum (OM) when

communicating internally to colleagues or sections
circulating instructions, decisions, or clarifications within the organisation
a distribution list is needed

Use a circular when

communicating information/instructions to a wider group
the same message must reach multiple units/branches

Format / Structure

Typical structure differences (common practice)

Document	Typical purpose	Audience	Distribution list	Tone
Official letter	Request / submission / reply	Specific recipient / external office	Usually no	Formal, neutral
OM	Internal instruction / communication	Internal staff/sections	Common	Formal, neutral
Circular	Broad information / instruction	Wider group	Common	Formal, clear

Step-by-Step Guide

Identify the audience: one recipient vs many.
Identify the workflow: external submission vs internal circulation.
Check if your office manual prescribes the document type.
Draft using the structure that matches the document type.

Examples (Illustrative)

If you are requesting leave approval: official letter/application.
If you are announcing a policy change internally: OM/circular (as per office practice).
If you are informing multiple branches of an instruction: circular.