Sébastien Ostertag

{{short description|French handball player (born 1979)}}

{{Use dmy dates|date=February 2025}}

{{Infobox handball biography

| name = Sébastien Ostertag

| image = Sébastien Ostertag (Tremblay en France HB) - Handball player of France (2).jpg

| fullname =

| nationality = French

| birth_date = {{birth date and age|1979|3|16|df=y}}

| birth_place = Paris, France

| height = 173 cm

| position = Left wing

| currentclub = Retired

| clubnumber =

| youthyears1 = 1985–1997

| youthclubs1 = Livry-Gargan HB

| years1 = 1997–2000

| clubs1 = Livry-Gargan HB

| years2 = 2000–2001

| clubs2 = Athletic Club de Boulogne-Billancourt

| years3 = 2001–2005

| clubs3 = Livry-Gargan HB

| years4 = 2005–2012

| clubs4 = Tremblay en France HB

| years5 = 2012–2015

| clubs5 = Chartres MHB 28

| nationalyears1 = 2005–2010

| nationalteam1 = France

| nationalcaps1 = 51

| nationalgoals1 = 113

| pcupdate =

| ntupdate = 3 September 2021

| medaltemplates =

{{MedalCountry|{{FRA}}}}

{{MedalCompetition|World Championship}}

{{MedalGold| 2009 Croatia | Team competition}}

{{MedalCompetition|European Championships}}

{{MedalBronze| 2008 Norway | Team competition}}

{{MedalGold| 2010 Austria | Team competition}}

}}

Sébastien Ostertag (born 16 March 1979 in Paris) is a French team handball player. He played on the France men's national handball team which won gold medals at the 2009 World Men's Handball Championship in Croatia.{{cite web | url=http://wch09cro.ihf.info/exchange/croatia/pdf/FRA-R.pdf | title=XXI Men's World Championship 2009, Croatia. Team Roster – France. | publisher=International Handball Federation | accessdate=2 February 2009 | url-status=dead | archiveurl=https://web.archive.org/web/20090206033139/http://wch09cro.ihf.info/exchange/croatia/pdf/FRA-R.pdf | archivedate=6 February 2009 }}