Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
invitation required
Grammar usage guide and real-world examplesUSAGE SUMMARY
"invitation required" is grammatically correct and usable in written English.
It is typically used as a noun phrase, often as a heading or subheading, to indicate that an invitation is necessary or mandatory for the event or activity being described. Example: "Invitation Required for Annual Gala Dinner" Please note that an invitation is required for entrance to our upcoming Annual Gala Dinner. Kindly RSVP by October 1st to ensure your attendance.
✓ Grammatically correct
News & Media
Science
Academia
Alternative expressions(3)
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
5 human-written examples
This was a free show: no admission charge, no invitation required.
News & Media
"Anyone can sign up for Google+ — no invitation required," Google exec Vic Gundotra announced in a blog post that also touts 99 improvements made to Google+ since June.
News & Media
No invitation required.
News & Media
Today, after lots of testing and tweaking, we're excited to open up Google Voice to the public, no invitation required.
News & Media
The invitation required all respondents to consent to participate in accordance with ethical research principles and invitees were asked to click on a link to the survey as their means of giving consent.
Science
Human-verified similar examples from authoritative sources
Similar Expressions
55 human-written examples
(Using a special "envelope liner," which looks like the ones in a stationery store, requires a second stamp; affixing a photograph to each invitation requires another).
News & Media
Two weeks ago I received an invitation requiring me to submit receipts and invoices to my local council so they could examine how I had spent my personalisation money and to establish to their satisfaction that I had not frittered my money away, coming as it does from the taxpayer.
News & Media
If the invitation requires an RSVP, promptly respond either way; if the office party is being hosted at a home, bring a host/hostess gift; and even if the party is in a grand ballroom, thank your hosts or boss before you leave.
Wiki
So it gets only the minimum of invitations required under the International Cricket Council's program.
News & Media
For example, the number of invitations required to achieve an eligible sample was notably higher than the initial proposed number (~25,000 versus 18,000).
No invitation is required.
Academia
Expert writing Tips
Best practice
When using "invitation required" as a heading, ensure that the conditions for obtaining an invitation are clearly stated elsewhere.
Common error
Avoid assuming that "invitation required" events offer open invitations. Always clarify how to request or obtain an invitation.
Source & Trust
82%
Authority and reliability
4.1/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "invitation required" primarily functions as a noun phrase, serving as a label or a concise indicator of a condition for entry or participation. Ludwig confirms its usability in written English.
Frequent in
News & Media
33%
Science
33%
Academia
33%
Less common in
Formal & Business
0%
Encyclopedias
0%
Wiki
0%
Ludwig's WRAP-UP
The phrase "invitation required" is a grammatically sound noun phrase used to denote that an invitation is a prerequisite for access. Ludwig confirms that it is a usable form in written English. While not as common as some alternatives like "invitation only", it is used across various contexts, including news, science, and academia. To avoid ambiguity, always ensure the method for obtaining an invitation is clearly communicated. Common alternatives include "invitation needed" and "by invitation".
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
invitation is a must
Emphasizes necessity using 'a must'.
invitation needed
Uses a simpler verb form.
invitation only
A more concise and common expression.
by invitation
Focuses on the method of access.
an invitation is necessary
Formal restatement of the requirement.
admission by invitation
Specifies 'admission' as the context.
invite-only event
Uses a compound adjective form.
rsvp required
Focuses on the response requirement.
restricted access
General term indicating limited entry.
entry by invitation only
Fuller, more explicit version.
FAQs
How can I use "invitation required" in a sentence?
You can use "invitation required" as a label, for example, "For the gala, "invitation required"; please RSVP by October 1st."
What's an alternative way to say "invitation required"?
Alternatives include "invitation needed", "invitation only", or "by invitation" depending on the context.
Is it redundant to say "invitation is required"?
While not strictly redundant, "invitation is required" is less concise than "invitation required" or "invitation only".
What does "invitation required" mean in the context of a private event?
It means you cannot attend unless you have received a specific invitation from the event organizer, and you should not attempt to attend without one.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
82%
Authority and reliability
4.1/5
Expert rating
Real-world application tested