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The 2006–07 season was the fourth season in the history of the Llanelli Scarlets rugby union team. They competed in the Celtic League, in which they finished in fourth place, as well as the Anglo-Welsh Cup and Heineken Cup. They won just one of their three Anglo-Welsh Cup matches and were knocked out in the pool stage, but despite being drawn in the same pool as Toulouse for a third year in a row, they won all six of their pool matches and qualified for the quarter-finals as the second seed, giving them a home tie against Munster. A 24–15 win at Stradey Park set up a semi-final away to Leicester Tigers, but although they led 17–16 early in the second half, they ended up losing 33–17.

Pos	Team	Pld	W	D	L	PF	PA	PD	TF	TA	TBP	LBP	Pts
2	Cardiff Blues	20	13	1	6	447	327	+120	53	33	6	3	63
3	Leinster	20	12	1	7	472	376	+96	54	37	7	4	61
4	Llanelli Scarlets	20	12	0	8	490	417	+73	61	41	9	0	57
5	Ulster	20	11	1	8	423	310	+113	45	31	4	5	55
6	Munster	20	12	0	8	379	294	+85	37	31	3	3	54

Pos	Team	Pld	W	D	L	PF	PA	PD	TF	TA	TBP	LBP	Pts
1	Sale Sharks	3	3	0	0	77	37	+40	8	6	0	0	12
2	Newcastle Falcons	3	2	0	1	51	55	−4	7	5	0	0	8
3	Llanelli Scarlets	3	1	0	2	40	53	−13	5	6	1	0	5
4	Harlequins	3	0	0	3	52	75	−23	7	10	1	2	3

Pos	Team	P	W	D	L	TF	TA	TD	PF	PA	PD	TBP	LBP	Pts
1	Llanelli Scarlets (2)	6	6	0	0	20	12	8	169	120	+49	3	0	27
2	Toulouse	6	3	0	3	18	17	1	147	145	+2	3	2	17
3	Ulster	6	2	0	4	10	15	−5	111	129	−18	1	1	10
4	London Irish	6	1	0	5	15	19	−4	124	157	−33	2	3	9