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Social cognition refers to all of the cognitive processes that allow us to understand others and their interactions and to adapt our own behavior in social relationships. It includes multiple abilities, from the perception of a stimulus to decision-making in a social context, relying on processes ranging from the unconscious and involuntary to the voluntary and intentional. Frontotemporal dementia (FTD) and Alzheimer's disease (AD) are two neurodegenerative diseases characterized by social cognition impairment and executive dysfunction. Moreover, atrophy of areas of the brain due to these diseases include regions involved in social cognition and/or executive functions. This is why several studies have investigated social cognition deficits in FTD and AD. However, the relationship between social cognition and other cognitive functions in these diseases, including executive functions, is still unclear. This paper offers a review of the literature concerning processes involved in social cognitive abilities within the scope of FTD and AD. More precisely, the relative involvement of executive functions in various social abilities will be addressed.