In this study, it is aimed to determination of the relationship between learning styles and TIMSS mathematics achievements of eighth grade students. Correlational research design that is one of the quantitative research methods, was used in this study. The sample of the research consists of 652 8th grade students 347 are male and 305 are female and the students continue their education in 11 different middle schools in the centre of Bayburt in Turkey. In the research, two data collection tools were used. The first tool is Perceptual Learning Style Preference Questionnaire (PLSPQ) that was developed by Reid (1987) and translated by Bengiç (2008) into Turkish. The second tool is 45-questions achievement test that selected from TIMSS 2011 mathematics questions according to experts' opinions. Frequency, percentage, average, standard deviation, ANOVA and correlation analysis were applied through SPSS for data analysis. The most dominant learning style of the students is auditory and the second one is kinaesthetic learning style. Students' general TIMSS scores vary between 11 and 94 and the average TIMSS achievement score is 43.38. Additionally, it was seen that there is no significant relationship between TIMSS mathematics achievement and learning styles.