In this study, whether there is a significant relationship between the personality traits, relationship beliefs, and conflict-resolution styles and whether there is any significant difference between some demographic variables with respect to marital adjustment were investigated. Additionally, the prediction of marital adjustment regarding personality traits, relationship beliefs, and conflict resolution styles was aimed. The study was conducted with 656 married individuals in total: 292 women and 364 men. Dyadic Adjustment Scale (DAS), Five-Factor Personality Inventory (FFPI), Relationship Beliefs Inventory (RBI), Conflict Resolution Styles Inventory (CRSI), and Personal Information Form were applied to the married couples in the research. The Pearson correlation coefficient methods, one-way ANOVA analysis, and stepwise regression analysis were used to analyze the data obtained. A positive relationship was found between total scores of dyadic adjustments and positive conflict, extraversion, agreeableness, conscientiousness, and openness to experience scales. A negative relationship was found between total scores of dyadic adjustment scale and negative conflict, neuroticism, disagreement is destructive, genders are different and partners don’t change subscales. It has been concluded that the marital adjustment of the individuals varies according to their gender, age, number of children, and marriage formation type variables. It has also been found that the strongest variables that predict marital adjustment are neuroticism in terms of personality traits, positive conflict, negative conflict, and withdrawal in terms of conflict-resolution styles, and partners don’t change and disagreement is destructive in terms of relationship beliefs. The results obtained were tried to be discussed under the light of the relevant literature.