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A National Secondary Road (Irish: Bóthar Náisiúnta den Dara Grád) is a category of road in Ireland. These roads form an important part of the national route network, but are secondary to the main arterial routes (which are classified as national primary roads. Secondary roads are designated route numbers higher than those used for primary roads, but with the same "N" prefix. Routes N51 and higher are all secondary roads.

National secondary roads have a default speed limit of 100km/h (62.5 mph), as along with national primary routes, they fall into the speed limit category of national roads.

Secondary routes are generally more poorly maintained than primary routes (although can vary widely), but often carry more traffic than regional roads. Some sections of secondary roads (usually approaching urban centres) are dual-carriageway, while many are narrow two-lane country roads, indistinguishable from regional roads.

Many national secondary roads, though not arterial routes between major cities, connect large areas to major population centres. For example, the N59 through County Galway and County Mayo, the N70 road through County Kerry (see Ring of Kerry), the N71 through West Cork. For this reason, many national secondary roads are well-travelled by tourists.

(XXXX) = Junction with road XXXX, e.g. (N21) = Junction with N21 road

• N57 - Defunct route designation. Swinford – Ballina route prior to its redesignation as the N26 National Primary Route.
• N64 - Defunct route designation. Oranmore – Claregalway route prior to its redesignation as the N18 National Primary Route.
• N79 - Defunct route designation. Enniscorthy – New Ross route prior to its redesignation as the N30 National Primary Route.

• Roads in Ireland
• Irish National Primary Roads
• Irish Regional Roads

• S.I. No. 209/1994: ROADS ACT, 1993 (DECLARATION OF NATIONAL ROADS) ORDER, 1994
• Roads Act 1993 (Classification of National Roads) Order 2006 (PDF) - Department of Transport