This infobox can display up to 6 flags. It is not only for national flags.

Parameters

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Only the |Name and |Image parameters are mandatory. However, |Use={{FIAV#Usage symbols}} is required for the |Symbol parameter. (see #Example).

General

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Name
Name of entity.
Article
Term to include before name of entity, e.g. the.
Image_size
Size of images to use in infobox; if not specified, default is 255x170px.

Flag-specific

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Each of these fields can be given a suffix from 2 to 6 in order to specify up to 6 variants (war flags, naval ensigns, air force ensigns, alternative civil flags, etc.) of the national flag, in addition to the main (non-suffixed) version considered the national flag. For an example, see Flag of Morocco. All of the following parameters are optional with the exception of |Image. However, |Use={{FIAV#Usage symbols}} is required for |Symbol. (see #Example).

Image
Filename excluding Image: or File: prefix.
Imagetext
Caption for the image.
Noborder
Leave this field blank to display image with border by default for rectangular flag. For non-rectangular flag, type no.
Nickname
Name of the flag.
Morenicks
More names of the flag, separated by commas.
Use
6-bit FIAV usage code (see {{FIAV#Usage symbols}}). Required for |Symbol.
Symbol
One or more IFIS symbols, e.g. [[File:IFIS Sinister.png|Obverse side of flag]] or {{FIAV|sinister}}. A list of these symbols can be seen at Glossary of vexillology#Other symbols or {{FIAV#Property symbols}}. |Use={{FIAV#Usage symbols}} is required.
Proportion
width:length, e.g. 2:3.
Adoption
Date on which the flag was adopted.
Relinquished
Date on which the flag was relinquished.
Design
Concise description of the design.
Alt
Alt text for the image, for visually impaired readers. See Wikipedia:Alternative text for images. If omitted or empty, the |Design parameter should contain a suitable description, or there should be nearby text in the article that describes the image.
Designer
Name of person(s) who designed the flag.

Example

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United Nations
Flag of the United Nations
UseOther
Proportion2:3 or 3:5
AdoptedDecember 7, 1946
DesignA white UN emblem (world map surrounded by two olive branches) on a light blue background.
Designed byDonal McLaughlin (emblem only)
{{Infobox flag
| Name = United Nations
| Article = the
| Image = Flag of the United Nations.svg
| Image_size = 200px
| Alt = Flag of the United Nations
| Use = 000000
| Symbol = [[File:IFIS Equal.svg]]
| Proportion = 2:3 or 3:5
| Adoption = December 7, 1946
| Design = A white UN emblem (world map surrounded by two olive branches) on a light blue background.
| Designer = [[Donal McLaughlin]] (emblem only)
}}

One flag

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{{Infobox flag
| Name = 
| Article = 
| Image = 
| Alt = 
| Noborder = <!-- Leave blank for rectangular flag; for non-rectangular flag, type "no". -->
| Nickname = 
| Morenicks = 
| Use = <!-- Required for |Symbol -->
| Symbol = <!-- |Use="6-digit FIAV usage code" is required. -->
| Proportion = 
| Adoption = 
| Relinquished = 
| Design = 
| Designer = 
}}

Two flags

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{{Infobox flag
| Name = 
| Article = 
| Image = 
| Alt = 
| Noborder = <!-- Leave blank for rectangular flag; for non-rectangular flag, type "no". -->
| Nickname = 
| Morenicks = 
| Use = <!-- Required for |Symbol -->
| Symbol = <!-- |Use="6-digit FIAV usage code" is required. -->
| Proportion = 
| Adoption = 
| Relinquished = 
| Design = 
| Designer = 

| Image2 = 
| Alt2 = 
| Noborder2 = <!-- Leave blank for rectangular flag; for non-rectangular flag, type "no". -->
| Nickname2 = 
| Morenicks2 = 
| Use2 = <!-- Required for |Symbol2 -->
| Symbol2 = <!-- |Use2="6-digit FIAV usage code" is required. -->
| Proportion2 = 
| Adoption2 = 
| Design2 = 
| Designer2 = 
}}

Three flags... and so on

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{{Infobox flag
| Name = 
| Article = 
| Image = 
| Alt = 
| Noborder = <!-- Leave blank for rectangular flag; for non-rectangular flag, type "no". -->
| Nickname = 
| Morenicks = 
| Use = <!-- Required for |Symbol -->
| Symbol = <!-- |Use="6-digit FIAV usage code" is required. -->
| Proportion = 
| Adoption =
| Relinquished =  
| Design = 
| Designer = 

| Image2 = 
| Alt2 = 
| Noborder2 = <!-- Leave blank for rectangular flag; for non-rectangular flag, type "no". -->
| Nickname2 = 
| Morenicks2 = 
| Use2 = <!-- Required for |Symbol2 -->
| Symbol2 = <!-- |Use2="6-digit FIAV usage code" is required. -->
| Proportion2 = 
| Adoption2 = 
| Design2 = 
| Designer2 = 

| Image3 = 
| Alt3 = 
| Noborder3 = <!-- Leave blank for rectangular flag; for non-rectangular flag, type "no". -->
| Nickname3 = 
| Morenicks3 = 
| Use3 = <!-- Required for |Symbol3 -->
| Symbol3 = <!-- |Use3="6-digit FIAV usage code" is required. -->
| Proportion3 = 
| Adoption3 = 
| Design3 = 
| Designer3 = 
}}