Future time perspective, perceived social support, and dispositional gratitude are topics of interest that positively influence people’s psychological health. Although gratitude has been positively associated with future time perspective and social support, this is the first study to investigate its mediating role in the relationships of future time perspective with perceived social support. A convenience sample of 1256 adults (55.1% women), mean age 34.55 years (SD = 13.92), completed self-reported measures of future time perspective (conceptualized as remaining time and opportunities), dispositional gratitude, and received and given social support. Results indicated that higher dispositional gratitude mediated the relationship between the perception of more remaining time and opportunities and greater perception of received and given social support. These findings highlight the importance of considering dispositional characteristics to better understand the impact of perceived future on the individuals’ subjective experience of social exchanges. Interventions addressing future time perspective and dispositional gratitude might have beneficial effects on individuals’ social well-being.