How to Write a Complaint Letter About a Coworker

To: [Manager's Name]
From: [Your Name]
Date: [Date]
Subject: Concern Regarding [Coworker's Name]'s Frequent Tardiness Dear [Manager's Name], I am writing to express a concern regarding [Coworker's Name]'s consistent tardiness and its impact on our team's workflow. Over the past [number] weeks, [Coworker's Name] has been arriving late to work on a regular basis. For example, on [specific date 1], they arrived at [time], and on [specific date 2], they arrived at [time]. These late arrivals have meant that [specific task/project] often gets delayed or requires other team members to cover their initial responsibilities. This not only creates additional work for the rest of us but also disrupts our morning huddle and project planning. I understand that occasional issues can arise, but this has become a recurring pattern. I am concerned that this ongoing tardiness could lead to missed deadlines and reduced team productivity. I would appreciate it if you could look into this matter and address it with [Coworker's Name]. Thank you for your attention to this. Sincerely, [Your Name]

To: [HR Department/Manager's Name]
From: [Your Name]
Date: [Date]
Subject: Formal Complaint Regarding Inappropriate Comments by [Coworker's Name] Dear [HR Department/Manager's Name], I am writing to formally report incidents of inappropriate comments made by my coworker, [Coworker's Name]. On [specific date 1] at approximately [time], during a team discussion about [topic], [Coworker's Name] made a comment that was [describe the comment briefly and objectively, e.g., offensive, discriminatory, unprofessional]. This comment made me and other colleagues feel [describe the impact, e.g., uncomfortable, disrespected]. Further, on [specific date 2] around [time], while in the break room, [Coworker's Name] said [describe the comment]. This type of language is not conducive to a respectful and productive work environment. I believe it is important for our workplace to be a safe and inclusive space for everyone, and these comments undermine that. I would like to request that this matter be investigated. Thank you for your time and consideration. Sincerely, [Your Name]

To: [Manager's Name]
From: [Your Name]
Date: [Date]
Subject: Concern Regarding Workload Distribution on the [Project Name] Project Dear [Manager's Name], I am writing to discuss my concerns about the current distribution of workload on the [Project Name] project. While I am committed to contributing to the success of our projects, I have observed that the tasks for [Project Name] have not been evenly distributed. Specifically, I have been consistently assigned [mention specific types of tasks or a larger portion of the workload] while [Coworker's Name] has been primarily responsible for [mention their tasks or less demanding tasks]. This has resulted in me working [mention overtime or feeling overwhelmed]. For example, on [specific date], I completed [number] hours on [specific task], while [Coworker's Name] completed [number] hours on [their tasks]. This pattern has been consistent for the past [number] weeks. I believe a more balanced approach to task allocation would allow for greater efficiency and prevent burnout within the team. I would appreciate it if we could discuss ways to ensure a more equitable distribution of responsibilities for future projects. Thank you for your understanding. Sincerely, [Your Name]

To: [Manager's Name]
From: [Your Name]
Date: [Date]
Subject: Challenges with Team Collaboration with [Coworker's Name] Dear [Manager's Name], I am writing to you today with a concern about team collaboration, specifically regarding my interactions with [Coworker's Name]. In recent weeks, I've encountered difficulties in collaborating effectively with [Coworker's Name] on shared tasks and projects. For instance, when I requested input or assistance on [specific task] on [date], I received [describe the lack of cooperation, e.g., no response, unhelpful feedback, or a refusal to assist]. This has impacted our ability to meet deadlines and maintain project momentum. Another example occurred on [date] during the [meeting name] meeting, where [Coworker's Name] was unwilling to share information regarding [specific topic], which was crucial for my progress on [my task]. I believe that strong teamwork is essential for our department's success. I am hoping we can find a way to improve our collaborative efforts. Thank you for your time and consideration. Sincerely, [Your Name]

To: [Manager's Name/HR Department]
From: [Your Name]
Date: [Date]
Subject: Concern Regarding Confidential Information Disclosure by [Coworker's Name] Dear [Manager's Name/HR Department], I am writing to express my serious concern regarding the handling of confidential information by my coworker, [Coworker's Name]. On [specific date], I overheard [Coworker's Name] discussing sensitive client information regarding [client name or project name] with [person they discussed it with, if known, or state "an unauthorized individual"] in an open area. This information included details about [briefly mention the type of confidential information, e.g., pricing, strategy, personal client data]. This disclosure is a breach of our company's confidentiality policy and could have significant repercussions for our clients and the company's reputation. I am deeply concerned about the implications of this incident. I request that this matter be thoroughly investigated and that appropriate steps be taken to reinforce the importance of maintaining confidentiality within the team. Thank you for your urgent attention to this serious matter. Sincerely, [Your Name]

To: [Manager's Name]
From: [Your Name]
Date: [Date]
Subject: Impact of Noise and Disruptions on Work Concentration Dear [Manager's Name], I am writing to bring to your attention a recurring issue concerning noise and disruptions from [Coworker's Name] that are significantly impacting my ability to concentrate and perform my work effectively. On multiple occasions, particularly during [specific times of day or days of the week], [Coworker's Name] has been engaged in loud phone conversations, [mention other disruptive behaviors, e.g., playing music without headphones, frequent loud personal discussions] that carry across the office. For example, on [date 1] at around [time], the loud conversations lasted for approximately [duration], making it very difficult for me to focus on my tasks, including [mention a specific task that requires concentration]. Similarly, on [date 2], [describe another instance]. While I understand that some level of office noise is expected, these specific and ongoing disruptions are making it challenging to maintain productivity and meet my daily objectives. I would appreciate it if you could address this issue to help create a more focused work environment for everyone. Thank you for your understanding. Sincerely, [Your Name]