Dedem is a village in Tosya District, in Kastamonu Province, Türkiye. Dedem lies at 1,059 m above sea level, in the Geçmiş Dağı mountains. It has 132 inhabitants. The nearest city is Tosya, 11.1 km to the west. Among the landmarks around are Abdurrahman Paşa Mosque (11.1 km).