Dissertation writing is one of the most important parts of student's academic career before they are awarded a degree. Among students dissertation writing is very common now-a-days, it takes number of days to complete. Students are must required to submit their dissertation in a suitable manner at master's level which requires hard work, strong research and high quality dissertation writing skills. Dissertation writer must be very careful in writing a dissertation. There are number of common mistakes that a dissertation writer can make. Following are the some common mistakes made by dissertation writer: 1. Wrong topic: A key to write good dissertation is choosing a right topic. It is necessary to choose a good topic, on which you can write easily or you have enough material to write, you must avoid choosing too broad topic. 2. Research: Dissertation writing process is wholly or partially depends on research, so it is necessary that you choose right sources to gather material for your dissertation. 3. Plan: It is compulsory to plan your dissertation; this will lessen the chances of errors. A plan contains deadline and the process or steps of writing a dissertation. 4. Research proposal: Correct research proposal and approved it by your teacher before writing a dissertation is very important. Research proposal includes following sections: Introduction, literature review, methodology and expected findings. Mostly students don't know the tips of writing correct dissertation proposal that is why, they also make mistake when writing a final copy. 5. Not having true hypothesis: Mostly students don't have a clear thought of how to make true hypothesis. They feel complexity in writing a hypothesis and explain it according to their research. It is one of the most common mistakes that a dissertation writer can make. 6. Using a passive voice: It is necessary to use active voice throughout your dissertation, avoid using passive voice. 7. Format: It is also one of the most common mistakes that a dissertation writer can make. Mostly students don't know the correct format of writing a dissertation; this is because they don't look at the instructions for a task. If a student doesn't follow the instructions they will surely lose the marks. 8. Grammar and punctuation: A common mistakes made by dissertation writer is not using of correct grammar and punctuation. It is necessary to carefully read the dissertation after completing each section. This will reduce the chance of errors and provide you an error-free copy. Above mistakes are easy to avoid, dissertation writer should be very careful when writing a dissertation.