Post SV Rugby ''PSV's
rugby department had been formed in 1967 in what was then East Germany, under the name of BSG Post Berlin Rugby''.
Post Rugby took part in the East German championship, the
DDR Rugby-Oberliga. It celebrated its greatest success in this league in the last decade of its existence, finishing third from 1985 to 1988, followed by two runners-up finishes in 1989 and 1990. Throughout its history, the club also provided a number of East German rugby internationals. In 2003, the clubs rugby department left
Post SV to form its own club, the RK 03 Berlin.
RK 03 PSV had last been playing in the
2nd Rugby-Bundesliga North/East in 2002-03 and
RK took its place there, winning the league in its first attempt. After a 28-23 victory over South/West champion
BSC Offenbach, the team earned promotion to the Bundesliga. A seventh place in the first division in 2004-05 proved not enough and
RK was relegated immediately, having won only one out of its fourteen games and losing the relegation match to
DSV 78/08 Ricklingen 12-14. The season after, in the 2nd Bundesliga, the club won the league once more but lost the championship final to
SC 1880 Frankfurt. In the following promotion match with now Bundesliga side
DSV 78/08 another loss meant another year in the second tier. In
2006-07,
RK only came second in the 2nd Bundesliga but the season after,
2007-08, it won its division once more and a 22-6 win over
ASV Köln Rugby earned it a second Bundesliga promotion. In 2008-09, the club was struggling against relegation, finishing in eight place, its rival for league survival being bottom of the table side
DRC Hannover.
DRC accepted direct relegation at the end of the season, making the relegation final unnecessary, meaning,
RK 03 will be playing in the Bundesliga for another season. On 19 January 2009, the club received the long-awaited approval from the city of Berlin to upgrade its facilities, allowing, among other things, the instalment of flood lights. The 2011-12 season saw the club finish above local rival
BRC for the first time, in 8th place and thereby condemning the other Berlin club to a relegation spot. RK 03 finished second in their group in the 2012-13 season and qualified for the north/east division of the championship round, where it came third. The club was knocked out in the quarter-finals of the play-offs after a 10–36 loss to
SC Neuenheim. In 2013–14 the team qualified for the championship and the play-offs once more, defeating
RK Heusenstamm 33–19 in the first round and losing to Heidelberger RK in the quarter-finals. In the 2014–15 season the club finished second in the north-east championship group and was knocked out by
RG Heidelberg in the quarter-finals of the play-offs. In the
2015–16 season RK won the north/east division of the Bundesliga but lost to TV Pforzheim in the semi-finals of the play-offs. ==Club honours==