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An internship recommendation letter is a signed letter about a student's work. A professor, mentor, or supervisor writes it to support an internship application. Students need the letter when an internship application asks for references.
This page covers the letter format, what to include, how to write it, and sample letters with blanks you can fill in. For recommendation letters in general, see our recommendation letter guide.
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An internship recommendation letter, also called an internship reference letter or an internship testimonial letter, is a letter in which someone who knows a student vouches for the student's skills, effort, and character to an internship team. It adds a trusted outside voice to a resume and an application.
The letter describes what the candidate did, how they did it, and why they would do well in the internship. A good letter reads like a short, honest account from a person who has seen the candidate at work or in class.
It differs from a professional letter of recommendation, which an employer writes for an experienced employee. The table below compares them side by side.
| Compare | Professional letter of recommendation | Internship reference letter |
|---|---|---|
| Structure | More detailed and complex | Confirms general skills and knowledge |
| Usually written by | An employer, in support of an employee | A professor, mentor, or supervisor |
| Written for | An employee with a professional background who wants further job opportunities | A candidate with related study or first work experience |
| Main evidence | Results at work, projects led, length of service | Coursework, class projects, part-time jobs, volunteering, a past internship |
You need an internship reference letter when an internship program, an employer, or a school placement office asks applicants for references, or when you want proof of your skills to stand next to a short resume with little work history.
Common cases include:
Before you ask for a letter, tell the writer which kind you need:
A general letter is usually addressed "To whom it may concern" and describes your strengths without naming a single employer. A targeted letter names the organization and the internship and speaks to the skills that role asks for, so it tends to carry more weight with that reader.
The best writer of a letter of recommendation for an intern is a professor, mentor, or supervisor who knows the candidate well and can describe real examples of their work, attitude, and growth.
Good choices are:
Avoid choosing a writer only for a prestigious title. A person who barely knows you can offer only general praise, and an internship team reads that as a weak letter.
An internship recommendation letter includes the writer's details, the candidate's name, how the writer knows the candidate, the candidate's key skills with examples, a clear endorsement, and the writer's signature and contact details.
Use this checklist to check a draft, or a letter you received, line by line:
The candidate should read the finished letter from start to end, if the writer shares it, to make sure each point is covered and names and dates are correct.
The recommendation letter format for an internship follows a standard business letter: a header with the writer's details and the date, a greeting, an opening paragraph, a body with examples, a closing paragraph, and a signature block.
A good internship reference letter has three parts: an introduction, a main part, and a conclusion. The table shows where each element goes.
| Part of the letter | What goes there | Tip |
|---|---|---|
| Header | Writer's name, title, organization, address, email, and the date | Use school or company letterhead if you have it |
| Greeting | "Dear Ms. [Last Name]" or "To whom it may concern" | A named reader is better when you know it |
| Subject line | "Recommendation for [Candidate's Name]" | Write it in bold so the purpose is clear at a glance |
| Opening paragraph | Who you are, who you recommend, and how you know them | Keep it to a few sentences |
| Body paragraphs | Skills, achievements, and qualities with concrete examples | Pick the strengths that match the internship |
| Closing paragraph | A clear endorsement and an offer to answer questions | Invite the reader to contact you |
| Signature block | "Sincerely," then the signature, full name, title, email, and phone | Sign by hand on a printed letter, or add an electronic signature to a PDF |
Most writers send the letter as a PDF on letterhead, or on paper when the program asks for a printed copy. A simple font, normal margins, and short paragraphs make it easy to read.
To write a letter of recommendation for an intern, gather details about the internship and the candidate first, then draft an introduction, a body with examples, and a conclusion, and proofread before you sign and send it.
The main part varies with the candidate's experience and background. What matters most is to be truthful and to give a rounded view of the person, so the reader gets a clear sense of their abilities and interests.
A letter for a candidate with little work experience draws on class projects, lab work, group assignments, volunteering, clubs, and part-time jobs. These show the same skills an internship team looks for: reliability, teamwork, curiosity, and the ability to learn fast.
Describe what the student did and what came of it. "Led a group of classmates through a semester research project and presented the results at the department showcase" gives the reader something real to picture.
Example body paragraph for a student with study experience only
"Maya Chen took my Introduction to Marketing course and led her group's final campaign project for a local bakery. She organized the team's research, wrote the customer survey, and presented the results to the bakery's owner, who used two of the group's ideas in her spring promotion. Maya asks good questions, meets every deadline, and helps classmates who fall behind. I am confident she would bring the same care to your marketing internship."
The opening line names the candidate and the writer's relationship to them; the closing line gives a clear endorsement. Lines like these work well:
A strong letter of reference for an intern is specific, honest, and focused on the internship. Use the lists below as a quick check before you send it.
The sample internship recommendation letters below give you a starting point: a letter from a professor, a letter from a previous employer, and a letter from an internship supervisor writing after the internship. Each has blanks for names, dates, and skills.
Sample 1. Letter of recommendation for an intern from a professor
From ________________
_____________________
_____________________
(Write your name, position, and school address here)
Date: ___________________, 20___
To: Mr./Ms. _______________
_____________________ (organization)
Reference Letter for an Internship
Dear ___________ / To whom it may concern,
I am pleased to recommend ___________ for an internship at ___________. I have known ___________ for ______ as their professor in ___________ (course or program) at ___________ (school).
In my class, ___________ stood out for ___________ (name a skill or quality). For example, ___________ (describe a project, paper, or task and its result). They also show ___________ (name another strength) and a real interest in ___________ (field or topic).
I am confident that ___________ will bring the same effort to your team. I would be glad to answer any questions about their work. You can reach me at the contact details below.
Sincerely,
_______________ (your signature)
_______________ (your full name and title)
Email: _______________
Phone: _______________
Sample 2. Letter of recommendation for an intern from a company
From ________________
_____________________
_____________________
(Write your name, position, and the company's address)
Date: ___________________, 20___
To: Mr./Ms. _______________
_____________________ (organization)
Letter of Recommendation for an Internship
Dear ___________ / To whom it may concern,
I highly recommend ___________ as a candidate for an internship at ___________. ___________ worked at ___________ (company) as a ___________ (position) from ______ to ______. In this role, ___________ was responsible for ___________ (main duties), including ___________ (other tasks).
___________ has excellent skills in ___________ (name the skills that fit the internship). For example, ___________ (give an example of a task and its result). ___________ is also ___________ (name a personal quality), which our team noticed when ___________ (give an example).
___________ would be an asset to your organization and has my highest recommendation. If you have any questions about their background or qualifications, please contact me.
Sincerely,
_______________ (your signature)
_______________ (your full name and title)
Email: _______________
Phone: _______________
Sample 3. Recommendation letter after an internship, from the internship supervisor
From ________________
_____________________
(Write your name, title, organization, and address)
Date: ___________________, 20___
To: Hiring Manager, _____________________ (organization)
Recommendation for ___________
Dear Hiring Manager,
I am pleased to recommend ___________, who completed an internship with the ___________ team at ___________ from ______ to ______. As ___________'s supervisor, I assigned and reviewed their daily work.
During the internship, ___________ ___________ (describe the main project and its result). ___________ also ___________ (describe a second strength with an example), and colleagues valued their ___________ (name a quality).
Any team would gain from ___________'s skills in ___________. I would be glad to share more about their work. You can reach me at ___________ or ___________.
Sincerely,
_______________ (your signature)
_______________ (your full name and title)
Email: _______________
Phone: _______________
To ask for an internship recommendation letter, choose a writer who knows your work, send a polite email with the internship details and your due date, give the writer plenty of time, and thank them once the letter is sent.
Think of the professors, supervisors, and mentors you have worked with recently. Keep those you worked with most closely and who formed a good impression of you.
An email is easier for the writer than a phone call or a message on social media. Explain which internship you are applying for, why you chose them, and what you hope they can speak to.
Make sure you send your request at least a week before the deadline so that you do not have to panic if the deadline is approaching and no reference is forthcoming. More notice shows respect for the writer's schedule.
Attach your resume, the internship description, and a few reminders of projects or results the writer saw.
Keep a friendly tone and make it easy for the person to say no. A writer who agrees gladly usually writes a stronger letter.
If you hear nothing for a while, send a short, polite reminder. When the letter is sent, thank the writer and later tell them how the application went.
Sample request email
Subject: Recommendation letter request for ___________ internship
Dear Professor ___________,
I am applying for a ___________ internship at ___________, and I would be grateful if you could write a recommendation letter for me. I took your ___________ course in ___________, and my project on ___________ is the work I am proudest of. The letter is due on ___________ and goes to ___________. I have attached my resume and the internship description.
Thank you for considering my request.
Best regards,
___________
These short answers cover common questions about internship recommendation letters that the sections above do not already answer.
Most are about one page, and half a page is often enough. Keep the writing focused on a few clear examples of what the student did well, and skip general phrases that could describe anyone.
For internships, people use the terms interchangeably. Both describe the candidate's skills and character to an internship team. Some employers use "references" to mean a list of contacts they can call, so read the application closely.
Yes, and the end of the internship is a good time to ask, while your work is fresh in the supervisor's mind. A letter from an internship supervisor helps with job applications and later internships.
Some writers ask the student for a draft or a list of points to save time. The writer should then rewrite it in their own words and sign only what they believe.
Follow the program's instructions. Many ask the writer to upload the letter to an online portal or email it directly, and some accept a sealed paper letter or a PDF the student attaches to the application.
Do not take it personally. The person may be busy or away, so follow up politely once and then ask someone else. A writer who agrees gladly will usually give you a stronger letter.
Use a sample as a guide, not a copy. Fill in the blanks with real details and add your own examples, so the letter sounds like it comes from someone who knows you.
General information, not legal or tax advice.
