The 2008–09 season is the sixth in the history of the Scarlets regional side. The season will see the Scarlets compete in three competitions: the Celtic League, the EDF Energy Cup and the Heineken Cup. The season welcomes a change of ground, with the team moving from their home of over 125 years, Stradey Park, to a new stadium in Pemberton named Parc y Scarlets, as well as a change in the team name, dropping the "Llanelli" from their moniker to become the Scarlets.

The Scarlets opened their 2008-09 Celtic League season away to Ulster on 5 September 2008. Despite playing against the wind in the first half, the Scarlets scored an early penalty in the sixth minute, before Darren Daniel scored the first try of the game, crossing in the corner. Clinton Schifcofske scored three penalties in response to make the half-time score 10–9 to the visitors. The Scarlets then took full advantage of the wind in the second half, Stephen Jones putting over two penalties to put the result beyond doubt. The Scarlets' next match came five days later, when they travelled to Rodney Parade to take on the Newport Gwent Dragons. The game looked out of the Llanelli side's reach at half time, as they trailed 25–6, but two unanswered tries from Martin Roberts and Nathan Brew, a conversion and two further penalties from Stephen Jones pulled the score back to 25–24. Brew came close to putting the Scarlets into the lead with 11 minutes to go, but fumbled the ball before he could get to the line, while Stephen Jones put an easy drop goal wide moments later. Fortunately for him, after Robert Lewis conceded a penalty in front of the posts, Jones finally gave the Scarlets a two-point win with three minutes left to play.

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