34 people and what they made or found, in date order. Where a Wikipedia article says "invented", this page says invented. Where it says "developed", "designed" or "credited with", that is all this page says too.
8 have no county here: they were born in Belfast (which lies in both Antrim and Down), outside Ireland, or somewhere nobody is sure of.
Not the submarine itself. John Philip Holland of Liscannor, County Clare, developed the first submarine to be formally commissioned by the US Navy, USS Holland (1900), and the Royal Navy's first, Holland 1.
Francis Rynd, a Dublin doctor, is known for inventing the hypodermic needle in 1844; his injection of a patient on 3 June 1844 is described as the first known hypodermic injection.
Frank Pantridge, born in Hillsborough, County Down, is credited with the invention; he installed the first version in a Belfast ambulance in 1965.
He is often credited with inventing chocolate milk, but his Wikipedia article says he more likely learned the practice of adding milk to drinking chocolate in Jamaica.
Each entry was read against the person's English Wikipedia article (October 2026), linked beside it. The year is the one the article gives for the work, and it is left blank where the article gives none. Born-in-county follows the article's infobox or text. 3 entries come with a caution where the article itself qualifies the claim.
Nobel laureates · Women in Irish history · Born in each county