| 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) | | | |
| 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 | | | | |
| OKINA I | Túmulo | Araba | MONTES DE VITORIA | Exacta (~25m) | | | |
| OKINA II | Túmulo | Araba | MONTES DE VITORIA | | | | |
| OKINA V | Túmulo | Araba | MONTES DE VITORIA | | | | |
| OKOLIN (Franxenda) | Menhir | Nafarroa | ABARTAN - SAIOA | Exacta (~25m) | | | |
| OKOLINGO LEPOA | Túmulo | Nafarroa | ABARTAN - SAIOA | Exacta (~25m) | | | |
| OLABERTA | Dolmen | Nafarroa | ARALAR | Aproximada (~200m) | | | |
| OLABURU | Dolmen | | KALAMUA | Exacta (~25m) | Oso kaltetuta | | |
| OLAETAKO ERREKA | Dolmen | | UREPEL – BAZTARLA | Exacta (~25m) | Nahiko egoera onean | | |
| OLAIKO | Dolmen | Donostia | ANDATZA - BELKOAIN | Exacta (~25m) | | | |
| OLAIZGAIN | Túmulo | Ezkabarte | JUSLAPEÑA | Exacta (~25m) | Oso kaltetuta | | |
| Olamuño Oeste I | Cromlech | | ARALAR | Exacta (~25m) | | | |
| Olamuño Oeste II | Cromlech | | ARALAR | Exacta (~25m) | | | |
| Olamuño Oeste III | Cromlech | | ARALAR | Exacta (~25m) | | | |
| Olamuño Oeste IV | Cromlech | | ARALAR | Exacta (~25m) | | | |
| Olamuño Sur | Cromlech | | ARALAR | Exacta (~25m) | | | |
| Olamuñoko Gaña | Cromlech | | ARALAR | Exacta (~25m) | | | |
| OLANO | Menhir | | SIERRA DE ALTZANIA | Exacta (~25m) | Egoera onean | | |
| OLANO | Fondo de cabaña | | SIERRA DE ALTZANIA | Exacta (~25m) | Egoera onean | | |
| OLANO 1 ekialde (Zelatamuño) | Dolmen | Nafarroa | BALENKALEKU - TXARADIGORRI | Exacta (~25m) | | | |
| OLANO 2 mendebal (Zelatamuño) | Dolmen | Nafarroa | BALENKALEKU - TXARADIGORRI | Exacta (~25m) | | | |
| OLARAN | Túmulo | | ERNIO | Exacta (~25m) | Nahiko egoera onean | | |
| OLARIAGA | Cromlech | Baztan | ABARTAN - SAIOA | Exacta (~25m) | | | |
| OLARIAGAKO LEPOA 2 | Cromlech | Baztan | ABARTAN - SAIOA | Exacta (~25m) | Oso kaltetuta | | |
| OLARIAGAKO LEPOA 1 | Cromlech | Baztan | ABARTAN - SAIOA | Exacta (~25m) | Oso kaltetuta | | |
| OLARKO HARRI | Dolmen | Nafarroa | ATXURI - ESKISAROI | Exacta (~25m) | | | |
| OLARTETA | Dolmen | Aia | PAGOETA - MEAGA | Exacta (~25m) | | | |
| Olasoro | Dolmen | | ARALAR | Exacta (~25m) | Nahiko egoera onean | | |
| Olasoro I | Túmulo | | ARALAR | Exacta (~25m) | | | |
| Olasoro II | Túmulo | | ARALAR | Exacta (~25m) | | | |
| OLASORO III | Túmulo | Gipuzkoa | ARALAR | Exacta (~25m) | Oso kaltetuta | | |
| OLDECUA | Menhir | | ARAGÜES DEL PUERTO | Exacta (~25m) | | | |
| Olderiz | Túmulo anular | | URBASA | Exacta (~25m) | | | |
| Olderiz 2 | Túmulo anular | | URBASA | Exacta (~25m) | | | |
| OLEGI | Dolmen | Ezkurra | ERAKURRI - MENDAUR | Exacta (~25m) | Oso kaltetuta | | |
| OLEGI EKIALDE | Cromlech | Nafarroa | ERAKURRI - MENDAUR | Exacta (~25m) | | | |
| OLEGI MENDEBAL | Cromlech | Nafarroa | ERAKURRI - MENDAUR | Exacta (~25m) | | | |
| OLEGIKO LEPOA | Cromlech | Nafarroa | ERAKURRI - MENDAUR | Exacta (~25m) | | | |
| OLETA | Túmulo | Gipuzkoa | IRUARRIETA | Exacta (~25m) | | | |
| OLHATEKO LEPOA | Túmulo | Baztan | SOALAR – AUTZA | Exacta (~25m) | | | |
| OLHETTE | Túmulo | | LARRAONA - LIZUNIAGA | Exacta (~25m) | | | |
| OLHETTE 2 | Túmulo | | LARRAONA - LIZUNIAGA | Exacta (~25m) | | | |
| Oliezu | Túmulo anular | | URBASA | Exacta (~25m) | | | |
| OLLANDI | Túmulo | Imotz | LARRAUN | Exacta (~25m) | Oso kaltetuta | | |
| OLLARAN | Túmulo | Ultzama | ARITZ - BELATE | Aproximada (~200m) | Nahiko egoera onean | | |
| OLLARGAN | Dolmen | Araba | ARAMAIONA | Exacta (~25m) | Nahiko egoera onean | | |
| Ollargarata | Túmulo | | GOIZUETA-ARTIKUTZA-ARANTZA | Exacta (~25m) | | | |
| Ollarmendi?? | Túmulo | Nafarroa | URKIAGA – ADI | Exacta (~25m) | | | |
| OLLASKARDI | Chabola tumular | Andia | ANDIA | Exacta (~25m) | | | |
| OLLASKARDI 3 | Chabola tumular | | ANDIA | Exacta (~25m) | | | |
| OLLIDE | Fondo de cabaña | Urbasa | URBASA | Exacta (~25m) | | | |
| Ollide | Túmulo | Urbasa | URBASA | Exacta (~25m) | | | |
| Ollide 3 este | Fondo de cabaña | Urbasa | URBASA | Exacta (~25m) | | | |
| OLLIDE ekialde | Fondo de cabaña | | URBASA | Exacta (~25m) | | | |
| Ollideko Bidea | Túmulo | Urbasa | URBASA | Exacta (~25m) | | | |
| Ollideko Bizkar | Menhir | Urbasa | URBASA | Exacta (~25m) | | | |
