| MUÑAZORROTZ TXIKI | Túmulo | | BRINKOLA - ZEGAMA | Exacta (~25m) | Oso kaltetuta | | |
| MUNDDURRU | Dolmen | Nafarroa | ALBA - KINTO | Exacta (~25m) | | | |
| MUNERRE | Cromlech | Oiartzun | OIARTZUN | Exacta (~25m) | | | |
| MUNHOGAIN | Cromlech | | MUNOA - ADARZA | Aproximada (~200m) | | | |
| MUNJOZURI | Túmulo | Bizkaia | ILUNTZAR | | | | |
| MUÑOBIL | Túmulo | | BELABIETA (Uzturre - Ipuliño) | Exacta (~25m) | Egoera onean | | |
| MUÑOBIL II | Túmulo | | BELABIETA (Uzturre - Ipuliño) | Exacta (~25m) | Oso kaltetuta | | |
| MUNTTO | Menhir | Gipuzkoa | ONDDI - ADARRA - MANDOEGI | | Nahiko egoera onean | | |
| MUNTTO | Cromlech | Gipuzkoa | ONDDI - ADARRA - MANDOEGI | Exacta (~25m) | Oso kaltetuta | | |
| MUNUXKETA (Oronbor) | Fondo de cabaña | Nafarroa | ABARTAN - SAIOA | Exacta (~25m) | | | |
| MURKHUILLAKO LEPOA | Cromlech | | BISKARTZU - ORGANBIDESKA | Exacta (~25m) | | | |
| MURKURUKO ARRIPILA | Dolmen | Nafarroa | ARALAR | Exacta (~25m) | | | |
| MURKURUKO ARRIPILA | Fondo de cabaña | | ARALAR | Exacta (~25m) | | | |
| Murruta | Cista | Gipuzkoa | IGORIN - AKOLA | Exacta (~25m) | | | |
| MURUGIL I | Túmulo | Aia | PAGOETA - MEAGA | Exacta (~25m) | Oso kaltetuta | | |
| MURUGIL II | Túmulo | Aia | PAGOETA - MEAGA | Exacta (~25m) | Oso kaltetuta | | |
| Mustillogorri | Túmulo | | ANDIA | Exacta (~25m) | | | |
| MUSTRIÑA | Cromlech | Nafarroa | GOIZUETA-ARTIKUTZA-ARANTZA | Exacta (~25m) | | | |
| MUSTRIÑA 2 | Cromlech | | GOIZUETA-ARTIKUTZA-ARANTZA | Exacta (~25m) | | | |
| MUSULUN | Dolmen | Nafarroa | ARITZ - BELATE | Exacta (~25m) | | | |
| Mutxurro Oskotz | Túmulo | Imotz | ULTZAMA | Exacta (~25m) | | | |
| MUXUGORRI | Túmulo | Urruña | LARRAONA - LIZUNIAGA | Exacta (~25m) | | | |
| MUXUGORRI IPAR | Menhir | Urruña | LARRAONA - LIZUNIAGA | Exacta (~25m) | | | |
| MUXUGORRI ekialde | Dolmen | Urruña | LARRAONA - LIZUNIAGA | Exacta (~25m) | | | |
| NAASIKO GOENA | Túmulo | Gipuzkoa | ELOSUA - PLAZENTZIA | Exacta (~25m) | | | |
| NABALATZ | Túmulo | Etxalar | ATXURI - ESKISAROI | Exacta (~25m) | | | |
| NAPALATZA | Dolmen | Gipuzkoa | ATAUN - BURUNDA | Exacta (~25m) | | | |
| NAPARBASOKO PUNTA | Menhir | Araba | SIERRAS DE ELGEA - URKILLA | Exacta (~25m) | | | |
| Naparbidea | Menhir | | ARALAR | Exacta (~25m) | | | |
| NAPAZAL | Túmulo | Huesca | Valle de AÍSA | Exacta (~25m) | Nahiko egoera onean | | |
| NAVAFRIA | Dolmen | San Martin Unx | Nafarroa Garaia | Exacta (~25m) | Oso kaltetuta | | |
| NEGUSARO | Cromlech | | Iparraldea | Aproximada (~200m) | | | |
| NEGUSARO 2 erdi | Túmulo | | ORIZUN - URKULU | Exacta (~25m) | | | |
| NEGUSARO 1 hego | Túmulo | | ORIZUN - URKULU | Exacta (~25m) | | | |
| NEGUSARO hego | Cromlech | | ORIZUN - URKULU | Exacta (~25m) | | | |
| NEKAITZ | Cromlech | Nafarroa | SOALAR – AUTZA | Exacta (~25m) | | | |
| NEKAITZ | Menhir | Nafarroa | SOALAR – AUTZA | Exacta (~25m) | | | |
| O BATALLERO 1 | Cromlech | | Valle de TENA | Exacta (~25m) | | | |
| O FURCO | Cromlech | | Valle de TENA | Aproximada (~200m) | Nahiko egoera onean | | |
| O GOLUSO | Dolmen | | Valle de TENA | Exacta (~25m) | | | |
| O BATALLERO 2 | Cromlech | | Valle de TENA | Exacta (~25m) | | | |
| O FORATO | Túmulo | | Valle de TENA | Aproximada (~200m) | Nahiko egoera onean | | |
| O ZOQUE | Túmulo | Huesca | Valle de TENA | Exacta (~25m) | Oso kaltetuta | | |
| Oaitzileku | Fondo de cabaña | | ARALAR | Exacta (~25m) | | | |
| OAMENDI | Dolmen | Gipuzkoa | BRINKOLA - ZEGAMA | Exacta (~25m) | | | |
| OBAS | Túmulo | Nafarroa | URBASA | Exacta (~25m) | | | |
| OBI | Campo tumular | Araba | MONTAÑA ALAVESA | | | | |
| OBIARRI | Túmulo | Goñerri | SALDISE | Exacta (~25m) | | | |
| OBIARRI | Túmulo anular | Goñerri | SALDISE | Exacta (~25m) | | | |
| OBIONETA | Menhir | | ARALAR | Exacta (~25m) | | | |
| OBIONETA 1 hego | Dolmen | Nafarroa | ARALAR | Exacta (~25m) | | | |
| OBIONETA 2 ipar | Dolmen | Nafarroa | ARALAR | Exacta (~25m) | | | |
| ODIEGO 1 ipar | Dolmen | Nafarroa | SOROGAIN – IBAÑETA | Exacta (~25m) | | | |
| ODIEGO 2 hego | Dolmen | Nafarroa | SOROGAIN – IBAÑETA | Exacta (~25m) | | | |
| ODIEGO 3 | Túmulo | | SOROGAIN – IBAÑETA | Exacta (~25m) | | | |
| OIALEGIKO LEPOA | Cromlech | Nafarroa | ALBA - KINTO | Exacta (~25m) | | | |
| OIAMUNO | Cromlech | Baztan | LEGATE - ALKURRUNTZ | Exacta (~25m) | Oso kaltetuta | | |
| OIANBIZKAR | Dolmen | | OIARTZABAL – LARROGAIN | Exacta (~25m) | Oso kaltetuta | | |
| OIANBURU | Túmulo anular | Ollaran | SALDISE | Exacta (~25m) | Nahiko egoera onean | | |
| OIANBURU | Menhir | Ollaran | SALDISE | Exacta (~25m) | Nahiko egoera onean | | |
| Oianburu 1 | Túmulo | Ollaran | SALDISE | Exacta (~25m) | | | |
| Oiangibela | Menhir | Leotz | Nafarroa Garaia | Exacta (~25m) | | | |
| Oianhondo | Menhir | | AURITZ - ERRO | Exacta (~25m) | Egoera onean | | |
| OIANLEKU ipar | Cromlech | Oiartzun | OIARTZUN | Exacta (~25m) | | | |
| OIANLEKU hego | Cromlech | Oiartzun | OIARTZUN | Exacta (~25m) | | | |
| OIANTZAR | Dolmen | Sunbilla | ERAKURRI - MENDAUR | Exacta (~25m) | | | |
| OIARRAR BEHEKOA | Túmulo | | GORRITI - HUITZI | Exacta (~25m) | | | |
| OIARRAR BEHEKOA | Campo tumular | Nafarroa | GORRITI - HUITZI | Exacta (~25m) | | | |
| OIARRAR GOIKOA | Campo tumular | Nafarroa | GORRITI - HUITZI | Exacta (~25m) | | | |
| OIARTZABAL 1 ipar (Biorreta) | Dolmen | Nafarroa | OIARTZABAL – LARROGAIN | Exacta (~25m) | | | |
| OIARTZABAL 2 hego (Biorreta) | Dolmen | Nafarroa | OIARTZABAL – LARROGAIN | Exacta (~25m) | Oso kaltetuta | | |
| OIDUI | Fondo de cabaña | | ARALAR | Exacta (~25m) | | | |
| OIHANBELTZ hego | Cromlech | | ERROZATE - OKABE | Exacta (~25m) | | | |
| OIHANBELTZ ipar | Cromlech | | ERROZATE - OKABE | Exacta (~25m) | | | |
| OIHANZABALEA | Menhir | Agoitz | BAIGURA - SALAZAR | Exacta (~25m) | Oso kaltetuta | | |
| OIHANZABALEA 1 | Cromlech | Agoitz | BAIGURA - SALAZAR | Exacta (~25m) | Oso kaltetuta | | |
| OIHANZABALEA 2 | Cromlech | Agoitz | BAIGURA - SALAZAR | Exacta (~25m) | Oso kaltetuta | | |
| OIHANZABALEA 3 | Cromlech | Agoitz | BAIGURA - SALAZAR | Exacta (~25m) | Oso kaltetuta | | |
| OILASKOA | Fondo de cabaña | | ORIZUN - URKULU | Exacta (~25m) | | | |
| OINDOLAR I | Dolmen | Villabona-Amasa | BELABIETA (Uzturre - Ipuliño) | Exacta (~25m) | | | |
| OINDOLAR II | Dolmen | Villabona-Amasa | BELABIETA (Uzturre - Ipuliño) | Exacta (~25m) | | | |
| OINDOLAR III | Dolmen | Villabona-Amasa | BELABIETA (Uzturre - Ipuliño) | Exacta (~25m) | | | |
| OINDOLAR IV | Dolmen | Villabona-Amasa | BELABIETA (Uzturre - Ipuliño) | Exacta (~25m) | Oso kaltetuta | | |
| OINETA | Menhir | Nafarroa | URBASA | Exacta (~25m) | | | |
| OIZA | Dolmen | Baztan | SOALAR – AUTZA | Exacta (~25m) | | | |
| OIZA | Menhir | Nafarroa | SOALAR – AUTZA | Aproximada (~200m) | | | |
| Oiza este | Dolmen | Baztan | SOALAR – AUTZA | Exacta (~25m) | | | |
| OIZO | Túmulo | Nafarroa | ARITZ - BELATE | Aproximada (~200m) | | | |
| OKALARRE | Dolmen | | ATXURI - ESKISAROI | Exacta (~25m) | | | |
| OKETA | Dolmen | Araba | MONTE GORBEA | | | | |
| OKETA 1 | Túmulo | Zigoitia | MONTE GORBEA | Exacta (~25m) | Nahiko egoera onean | | |
| OKETA 2 | Túmulo | Zigoitia | MONTE GORBEA | Exacta (~25m) | Oso kaltetuta | | |
| OKETA 3 | Túmulo | Zigoitia | MONTE GORBEA | Exacta (~25m) | Nahiko egoera onean | | |
| OKETA 4 | Túmulo | Zigoitia | MONTE GORBEA | Exacta (~25m) | Nahiko egoera onean | | |
| OKETA 5 | Túmulo | Zigoitia | MONTE GORBEA | Exacta (~25m) | Nahiko egoera onean | | |
| OKETA 6 | Túmulo | Zigoitia | MONTE GORBEA | Exacta (~25m) | Nahiko egoera onean | | |
| OKETA 7 | Túmulo | | MONTE GORBEA | Exacta (~25m) | Oso kaltetuta | | |
| OKINA I | Túmulo | Araba | MONTES DE VITORIA | Exacta (~25m) | | | |
| OKINA II | Túmulo | Araba | MONTES DE VITORIA | | | | |
| OKINA V | Túmulo | Araba | MONTES DE VITORIA | | | | |
