P: 24 W: 6 D: 4 L: 14
Previously: Cardiff City Reserves; Cardiff City U21
Last meeting: 28 Nov 2000 — Cardiff City v Llanelli (1-2)
| Season | Date | Match | Result | Score | Competition |
|---|---|---|---|---|---|
| 1912-13 | Llanelli v Cardiff City | L | 1-4 | FA CUP | |
| 1912-13 | 01 Jan 1913 | Cardiff City v Llanelli | L | 0-5 | LEAGUE |
| 1912-13 | 29 Mar 1913 | Llanelli v Cardiff City | L | 0-2 | LEAGUE |
| 1948-49 | 08 Sep 1948 | Cardiff City Reserves v Llanelli | D | 2-2 | LEAGUE |
| 1948-49 | 04 Dec 1948 | Llanelli v Cardiff City Reserves | L | 1-2 | LEAGUE |
| 1967-68 | 11 Nov 1967 | Llanelli v Cardiff City Reserves | W | 4-1 | LEAGUE |
| 1967-68 | 13 Jan 1968 | Cardiff City Reserves v Llanelli | L | 0-6 | LEAGUE |
| 1968-69 | Cardiff City Reserves v Llanelli | LEAGUE | |||
| 1968-69 | Llanelli v Cardiff City Reserves | LEAGUE | |||
| 1969-70 | Cardiff City Reserves v Llanelli | LEAGUE | |||
| 1969-70 | 15 Nov 1969 | Llanelli v Cardiff City Reserves | L | 1-2 | LEAGUE |
| 1970-71 | 02 Jan 1971 | Llanelli v Cardiff City Reserves | L | 0-3 | LEAGUE |
| 1971-72 | 22 Feb 1972 | Llanelli v Cardiff City | L | 0-1 | WELSH CUP QF |
| 1972-73 | 02 Sep 1972 | Llanelli v Cardiff City Reserves | W | 4-0 | LEAGUE |
| 1972-73 | 10 Mar 1973 | Llanelli v Cardiff City Reserves | D | 2-2 | SA BRAINS CUP 4R |
| 1974-75 | Cardiff City Reserves v Llanelli | L | 0-2 | LEAGUE | |
| 1974-75 | 01 Feb 1975 | Llanelli v Cardiff City Reserves | W | 2-0 | LEAGUE |
| 1975-76 | Llanelli v Cardiff City Reserves | D | 1-1 | LEAGUE | |
| 1975-76 | 08 Nov 1975 | Cardiff City Reserves v Llanelli | L | 2-5 | LEAGUE |
| 1976-77 | Cardiff City Reserves v Llanelli | W | 3-2 | LEAGUE | |
| 1976-77 | Llanelli v Cardiff City Reserves | W | 4-1 | LEAGUE | |
| 1979-80 | Llanelli v Cardiff City Reserves | L | 0-4 | LEAGUE | |
| 1979-80 | 29 Mar 1980 | Cardiff City Reserves v Llanelli | L | 0-4 | LEAGUE |
| 1980-81 | 28 Mar 1981 | Cardiff City Reserves v Llanelli | D | 1-1 | LEAGUE |
| 1980-81 | 06 Apr 1981 | Llanelli v Cardiff City Reserves | W | 1-0 | LEAGUE |
| 2000-01 | 31 Oct 2000 | Llanelli v Cardiff City | L | 2-3 | FAW PCG |
| 2000-01 | 28 Nov 2000 | Cardiff City v Llanelli | L | 1-2 | FAW PCG |