Medium Diet Coke Price at McDonald's (2026)
A Medium Diet Coke costs €4.2 at McDonald's in Ireland (updated August 2026).
A Medium Diet Coke® at McDonald's costs €4.20 in Ireland as of August 2026. That's about 14% above the average McDonald's Cold Drink item — the 5th-most-expensive of 15 we track. It's available at around 73 McDonald's locations across Ireland. Prices are sourced from delivery platforms and refreshed regularly. Check the full McDonald's menu or compare Cold Drink prices on MenuPriceToday.
How this compares in Cold Drinks
15 items tracked| This item | €4.20 |
| Cold Drinks median | €4.20 |
| Cheapest — Fresh Irish Low Fat Milk | €2.25 |
| Most expensive — Mango & Pineapple Iced Fruit Smoothie | €5 |
| vs Cold Drinks median | 0% |
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