Sergio DellaPergola (born Trieste, Italy, September 7, 1942) is an Italian-born Israeli demographer and statistician. He is a professor and demographic expert, widely acknowledged as the leading authority in demography and statistics related to the Jewish population all over the world. Born into an Italian-Jewish family, DellaPergola made aliyah to Israel in 1966. He holds an M.A. from the University of Pavia and a Ph.D. from the Hebrew University of Jerusalem and is a Professor Emeritus of Population Studies at the Hebrew University’s Avraham Harman Institute of Contemporary Jewry, where he was the Institute Chair and Director of the Division of Jewish Demography and Statistics and held the Shlomo Argov Chair in Israel-Diaspora Relations.
DellaPergola is a specialist on the demography of world Jewry and has published numerous books and over two hundred papers on historical demography, the family, international migration, Jewish identification, and population projections in the Diaspora and in Israel. He has written extensively about demography in Israel and Palestine. He has lectured at over 70 universities and research centers in Western Europe, North America and Latin America, and served as senior policy consultant to the President of Israel, the Israeli government, the Jerusalem municipality, and many major national and international organizations. 
He served on the National Technical Advisory Committee for the 1990 and 2000-01 National Jewish Population Surveys, and on the experts committee of the 2013 Pew Research Center survey of Jewish Americans. He was Visiting Professor at the Oxford Centre for Hebrew and Jewish Studies in 2002-03, at Brandeis University in 2006, at the University of Illinois at Chicago (UIC) in 2009 and at the University of California, Los Angeles (UCLA) in 2010. He is a member of the Yad Vashem Committee for the Righteous of the Nations. 
In 1999, DellaPergola won the Marshall Sklare Award for distinguished achievement from the Association for the Social Scientific Study of Jewry (ASSJ) and his award presentation was entitled: "Thoughts of a Jewish Demographer in the Year 2000". In 2013, he was awarded the Michael Landau prize for Migration and Demography.
- Sergio DellaPergola. "World Jewish Population, 2010". Berman Institute – North American. p. 59.
- Official webpage at Hebrew University site
- Hava Pinchas-Cohen, "In the future, most Jews will live in Israel", Hava Pinchas-Cohen interviewed Sergio DellaPergola, about numbers and the trends these indicate. Eretz Acheret magazine
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