Constantin Dan Vasiliu (born 15 February 1951) is a Romanian politician.
He was born in Bârlad, Romania, and is the son of Mihai (Melu) Vasiliu and of Lucia Vasiliu (née Perida) (see Tasca family).
He studied economics at the Alexandru Ioan Cuza University of Iasi.
After graduation, he worked at the Tepro Company in Iasi where he eventually was promoted Commercial Director of the Company.
After 1989, Constantin Dan Vasiliu entered politics.
In 1992, he was elected senator for the National Salvation Front; in this capacity, he was vicepresident of the Senate of Romania from 1994 to 1996.
Reelected in 1996 on the lists of the Democratic Party, he was chairman of the parliamentary group of the Democratic Party.
From 1996 to 2000 he was also secretary of the senate's "Budget, Finance and Banking Commission".
In 2000 he was reelected Vicepresident of the Senate.
Constantin Dan Vasiliu also was Vicechairman of the "Romanian-Australian Friendship Group" and member of the "Group for the Friendship between Romania and the Republic of Moldova".
From 2000 to 2004 he was advisor to the Senate of Romania.
At present he is Secretary General of the Senate.
He is leader of the Democratic Liberal Party organization of Iasi County.