Sebastian Östling

John Sebastian Östling (born 2 June 1984 in Onsala, Kungsbacka) is a Swedish sailor, who specializes in the 470 class, a two-person dinghy. He represented Sweden, along with his partner Anton Dahlberg, in two editions of the Olympic Games (2008 and 2012), and has also been training representing Royal Swedish Yacht Club throughout most of his sporting career under his personal coach and mentor Per Frykholm.

Olympic 470 campaigns with Dahlberg (2007–2012)
Sebastian Östling and Anton Dahlberg had gone to the same national sports' secondary school (riksidrottsgymnasium), but started to sail together first when they both were studying at the Stockholm School of Economics. Dahlberg and Östling finished 35th out of 112 in the men's 470 event at the 2007 ISAF Sailing World Championships in Cascais, taking in a bullet in the first race of the opening series.

Östling made his Olympic debut at the 2008 Summer Olympics in Beijing, where he paired up with skipper Dahlberg in the men's 470 class. The Swedish duo finished 15th in a ten-round opening series with a net score of 111, trailing Israelis Gideon Kliger and Udi Gal by a narrow, three-point gap from the final standings.

At the 2012 Summer Olympics in London, Östling competed for the second time as a crew member in the men's 470 class by finishing eleventh and receiving a berth from the ISAF World Championships in Perth, Western Australia. Teaming again with Dahlberg in the opening series, the Swedish duo mounted four top 10 finishes to guarantee a spot in the final race, but fell short for the podium with an accumulated net score of 123 points and a tenth-place finish in a fleet of twenty-seven boats.

Olympic 470 campaign with Molund
Östling then paired with Johan Molund aiming for the 2016 Summer Olympics. The duo won the 2015 Delta Lloyd Regatta in Medemblik.