The club was founded on 25 May 1970 and started playing as
Sunair Oostende. The team colors were blue and yellow.
BCO – a nickname of the club – started in the Belgian Second Division but promoted in its first season after it took the title. But in the
First Division the team relegated immediately. But BCO bounced back and promoted once again and got its final spot in the First Division, as they never relegated since. In the 1974–75 season the club made its first appearance in
Europe, when it played 10 games in the
Korać Cup. In 1979 the first trophy was won by Oostende: the
Belgian Basketball Cup with Ron Adams as head coach. In 1981 the first national title became a fact for BC Oostende, Roger Dutremble was head coach. The club eventually won 6th straight titles in a row in Belgium. In 1988 the club won the first and only
BeNeLux Cup. Before the 1999–2000 season the club got its first name change, as the name of the club became
Telindus Oostende, which referred to the new main sponsor. After the club won some more trophies to add to its honour list, the club got a new arena in the
Sea'rena – that was named the Sleuyter Arena after one season and had a capacity of 5,000 people – in 2005.
Fourteen consecutive championships (2011–2025) Before the start of the 2010–11 season the club name was changed in
Telenet (BC) Oostende. In the second Telenet season
Jean-Marc Jaumin was fired by the club and the Croatian coach
Dario Gjergja took over his tasks. After that the club won the national title, by beating
Spirou Charleroi 3–2 in the Finals, Game 5 ended in 75–74 after
overtime. The championship in 2011 was the start of a nice streak for Gjergja, as BCO won the double in 2012–13. Star player of the team was
Matt Lojeski, who was named
League MVP. In 2013–14, the club won the double once again, as BCO beat
Okapi Aalstar 3–2 in the Finals. Oostende earlier beat
Antwerp Giants in the Cup Final. The Serbian point guard
Dušan Đorđević shined for Oostende, as he was the
Belgian Cup MVP and the league MVP. On September 23 (2014), the club retired
Veselin Petrović's number 10. In 2017, the club won its sixth-consecutive championship. After the 2016–17 season, main sponsor Telenet left the club in order to sponsor
Antwerp Giants instead. In 2018, the club set a new record by winning its seventh consecutive championship. In the 2018–19 season, the team was named Filou Oostende after a sponsorship agreement with beer brand Filou, brewed by
Van Honsebrouck Brewery. In 2019 Ostend became champions again, for the eighth time in a row. They beat Antwerp in the finals. In 2020 Ostend was declared champions when the 2019–20 season was cancelled due to the
COVID-19 pandemic. They were leading the standings at that time. On July 2, 2020, head coach
Dario Gjergja extended his contract for five more year. On July 7, team captain Đorđević extended his contract for two more years until 2022. On 9 June 2021, Ostend secured their 10th consecutive domestic title. By beating Mons-Hainaut in the final series (3-1) Ostend brought home the 7th double in 10 years, as they beat
Mechelen in the cupfinal earlier in the season. Since the
2021–22 season, Oostende plays in the
BNXT League, in which the national leagues of Belgium and the Netherlands have been merged. On May 8, 2024 the club retired
Dusan Djordjevic's shirt number 20. He won 12 consecutive national championships with the team. ==Sponsorship names==