Dionysis Tsamis (Greek: Διονύσης Τσαμής; born 1962) is a Greek former professional basketball player. He primarily played as a small forward during his career.
Tsamis is best known for his time with prominent Greek clubs, particularly Panionios and Olympiacos. He began his career with Panionios, where he established himself as a key player. Later, he moved to Olympiacos Piraeus, one of Greece's most successful basketball teams, contributing to their domestic success. With Olympiacos, Tsamis won multiple Greek League championships in the mid-1990s.
He was also a member of the Greek national basketball team, representing his country in various international competitions. Tsamis's career spanned a significant period in Greek basketball, marking him as a notable figure of his era.