P: 8 W: 6 D: 1 L: 1
Last meeting: 04 Apr 2015 — Treharris Athletic Western v Llanelli (4-0)
| Season | Date | Match | Result | Score | Competition |
|---|---|---|---|---|---|
| 1996-97 | 12 Oct 1996 | Treharris Athletic Western v Llanelli | D | 2-2 | WELSH CUP 2R |
| 1996-97 | 16 Oct 1996 | Llanelli v Treharris Athletic Western | W | 4-0 | W CUP2RRE |
| 2003-04 | 14 Feb 2004 | Llanelli v Treharris Athletic Western | W | 4-0 | LEAGUE CUP |
| 2004-05 | 14 Feb 2005 | Llanelli v Treharris Athletic Western | W | 4-0 | LEAGUE CUP |
| 2013-14 | 10 Jan 2014 | Llanelli v Treharris Athletic Western | W | 6-1 | LEAGUE |
| 2013-14 | 03 May 2014 | Treharris Athletic Western v Llanelli | L | 2-3 | LEAGUE |
| 2014-15 | 27 Sep 2014 | Llanelli v Treharris Athletic Western | W | 10-1 | LEAGUE |
| 2014-15 | 04 Apr 2015 | Treharris Athletic Western v Llanelli | W | 4-0 | LEAGUE |