Abstract: The study investigates the effect of board characteristics and firm performance on disclosure tones by considering DICTION five master variables namely activity, optimism, certainty, realism and commonality tones using a sample of 779 annual reports of GCC listed firms (2012 to 2018). Disclosure tones of the sampled GCC firms were measured through corporate narrative disclosures by DICTION 7.0 software. Then, the ordinary least square regression analysis was conducted. The main findings of the study show that firm performance has a significant effect on disclosure tones in terms of activity, optimism, certainty, and realism tones except for commonality reported tone. Board characteristics have different effects on the five disclosure tones. The study offers a unique contribution to accounting literature as it is one of the first studies in the Gulf region that seeks to examine the relationship between disclosure tones and firm performance as well as board governance.