Grievance Letter Example against a Coworker

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This page lasted updated 7.7.26.

This website will assist you in knowing how to write a complaint letter against a coworker, and furthermore, tips for writing a complaint letter about a coworker who is bullying and harassing you.

Sam & Amy have created the following new webpages for 2026:

• Read This First!
• Don’t use AI to write your grievance letter.
• 15 steps to take before you write your grievance letter.
• 20 Tips on writing your grievance letter.
• Free grievance letter example for ‘work-related stress, bullying, harassment and discrimination’.
• What not to say in a grievance meeting.
• How to win a grievance appeal.

Sample of complaint letter against a person with unprofessional behaviour:

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Below are the steps to take for a grievance complaint against a coworker with unprofessional behaviour at work:

• Step 1 = Identify the names of the coworkers who are subjecting you to bullying and harassment at work within your grievance complaint letter.
• Step 2 = Outline in your grievance complaint letter how being subjected to unprofessional behaviour by a coworker is making you feel i.e., the injury caused to your feelings as the complainant.
• Step 3 = Outline in your grievance complaint letter how being subjected to unprofessional behaviour by a coworker is impacting your health and wellbeing i.e., I am not sleeping, I am losing weight, I dread coming to work etc,.
• Step 4 = Provide as many examples of bullying and harassment within your grievance complaint letter as you can, in order to document the unprofessional behaviour, which the coworker has / is subjecting you to.
• Step 5 = Provide the date/s and time/s where possible, of the incidents of bullying, which the coworker has subjected you to.
• Step 6 = Describe in your grievance complaint letter the toxic working environment caused by the bullying and harassment of your coworkers.
• Step 7 = Outline the steps in your grievance complainant letter, which you want your employer to take in order to put an end to the bullying, which the coworker is subjecting you to.

Firstly, we suggest you read our webpage on what not to say in a grievance letter and our 20 tips on writing a grievance letter.

Secondly, we suggest you visit our free grievance letter sample, which covers work-related stress, bullying and harassment, discrimination.

Free example grievance compliant letter against a coworker with unprofessional behaviour i.e., how do you write a complaint letter against an employees attitude at work:

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Date:

Dear Manager (name),

RE: GRIEVANCE LETTER AGAINST COWORKERS

1. I am writing a formal complaint letter against my coworkers John Doe and Jane Smith for unprofessional behaviour at work.
2. The unprofessional behaviour of my coworkers has caused and is causing injury to my feelings.
3. The conduct of my coworkers is impacting my physical and psychological health and wellbeing too. This grievance is therefore raised as a health and safety matter in accordance with s.44(1)(c) of The Employment Rights Act 1996.
4. I am not sleeping very well and am dreading coming to work. I lay awake at night having ruminating thoughts about my coworkers treatment of me, which is affecting my health and well-being. My doctor has prescribed sleeping tablets and anti-depressant medication. Thus, a ‘causal link’ exists between the bullying and harassment by my coworkers, and my doctor prescribing me with sleeping pills and anti-depressant medication.
5. Numerous incidents of unprofessional behaviour has ultimately led to a toxic work environment in which to communicate with my coworkers.
6. On 2.1.26, John Doe shouted at me across the office in front of my workplace colleagues. This was humiliating and embarrassing as I felt all eyes were on me. My coworker John demeaned me, belittled me, and castigated me in front of my fellow workplace colleagues, which undermined the implied term of mutual trust and confidence in them.
7. However, and for the avoidance of doubt, this was not the first incident whereby my coworkers have created a hostile, oppressive, and intimidating work environment. On the 4.7.26, I walked into the office and greeted everyone by saying “good morning”. My coworker Jane asked me what was so good about this particular morning. My coworker John then laughed at me and repeated the question. I just stated I was being pleasant by greeting my fellow workplace colleagues. Jane then also laughed at me, rolled her eyes, and looked at other workplace colleagues making out I was deluded. This was really uncomfortable for me. John then muttered something under his breath. I did not hear what John stated, but later my workplace colleague (Betty Davis) told me that John Doe had called me a “bitch”.
8. I expect my employer to take reasonable steps to put an end to the bullying and harassment by my coworkers, which treatment is making me feel ill, and moreover, which treatment is having a profound and detrimental impact on both my physical and psychological health and wellbeing. To this end, I am asking my employer to promote, champion, and embed a working environment with both dignity and respect, and which working environment is free from bullying and harassment at work.
9. For the avoidance of doubt, being called a “bitch” is harassment related to my sex and amounts to sexual harassment. I very much Doubt John would have called a male employee a “bitch”. Therefore, my sex was a contributing cause for the unlawful harassment.
10. Please confirm receipt of this grievance letter as a letter of bullying and harassment by my co-workers.

The above grievance complaint letter against coworkers, outlines both ‘facts and information’ i.e., what happened, when it happened, and who the culprits are, including the name of a witness.

The above grievance complaint letter template for workplace bullying and harassment is a ‘protected act’ in accordance with s.27(2)(d) of The Equality Act 2010. Put shortly, making a complaint of ‘harassment’ is a ‘protected act’ which protects you from ‘victimisation’ by either your employer, boss, or coworkers.

Moreover, by using the grievance letter template above for bullying by coworkers, you are also raising your grievances as “health and safety” matters in accordance with s.44(1)(c) of The Employment Rights Act 1996:

“He brought to his employer’s attention, by reasonable means, circumstances connected with his work which he reasonably believed were harmful or potentially harmful to health or safety”.

The above are the steps to take for raising a grievance letter against your coworkers.

My wife Amy and I are employment consultants with 26 years combined experience. Over the past decade Amy and I have helped thousands of clients with internal employment disputes covering bullying, harassment, discrimination, unfair dismissal, suspension from work, unfair capability, unfair disciplinary, being put on a performance improvement plan, being made redundant, blowing the whistle, work-related stress, sickness absence, pay, disputes with occupational health, and unfair workplace investigations.

Amy & I know firsthand the stress, anxiety, and distress, which you feel caused by work-related stress, not least because both Amy and I took our own employers to the employment tribunal for sex and disability discrimination, harassment, unlawful victimisation and detrimental treatment for blowing the whistle. For the avoidance of doubt, we only help employees, NOT employers.

Word of Caution:

• Do NOT use AI to generate your grievance letter.
• For the avoidance of doubt, there are many free AI detectors online, which are 99% accurate in detecting whether a grievance letter has been AI-generated.
• The Employment Tribunal Service is receiving an uptick in AI generated grievance letters, which are frowned upon.
• Notwithstanding, AI can cite case laws which do not exist, apply legislation from other jurisdictions, or outline legal principles that have absolutely no bearing on your particular circumstances.
• We do NOT use any AI in the letters, which we write for our clients.

You don’t have to go through the grievance process alone! We are here to help you. Amy & I can assist you in avoiding the pitfalls and common mistakes which we see employees make. You only get one chance to get your grievance letter right, so make sure you do just that!

Over the past 15 years Amy & I helped thousands of clients address their grievances with their employers. Please read our testimonials page.

Amy & I can assist you in writing a grievance letter for any of the following work-related matters:

• grievance letter for bullying and harassment
• toxic working environment
• grievance letter against a coworker
• constructive unfair dismissal
• work-related stress
• stress at work employee rights UK
• grievance for work-related stress
• Sickness absence meeting
• what not to say to occupational health
• resignation letter
• raise a grievance at work.
• unfair treatment at work
• performance improvement plan
• how to beat a disciplinary hearing
• disciplinary workplace investigation.
• suspended from work
• blow the whistle
• victimisation at work UK
• workplace investigation
• reasonable adjustments equality act 2010.
• pregnancy and maternity discrimination
• sexual harassment in the workplace.
• disability discrimination
• what not to say at a grievance meeting

Go on, pick up the phone and call us to arrange a telephone consultation on 07775943414.

We work 7 days a week (9-5 UK time) because we know that your employment problems don’t just end on a Friday afternoon!

We only charge £35 up to one hour for the initial consultation and £50 an hour thereafter.