| OSIN | Dolmen | Biriatu | XOLDOKOGAÑA - IBARDIN | Exacta (~25m) | Oso kaltetuta | | |
| OSTALAZA 2 | Campo tumular | Urbasa | URBASA | Exacta (~25m) | | | |
| OSTALAZA 3 | Campo tumular | Urbasa | URBASA | Exacta (~25m) | | | |
| OSTALAZA 1 | Campo tumular | Nafarroa | URBASA | Exacta (~25m) | | | |
| OSTALAZA 4 | Campo tumular | Nafarroa | URBASA | Exacta (~25m) | | | |
| OSTALAZA 5 | Campo tumular | Nafarroa | URBASA | Aproximada (~200m) | | | |
| OSTALAZA 6 | Campo tumular | Nafarroa | URBASA | Aproximada (~200m) | | | |
| OSTOLAZA | Menhir | Urbasa | URBASA | Exacta (~25m) | | | |
| Ostondo | Campo tumular | Goñerri | ANDIA | Exacta (~25m) | | | |
| OTADI | Dolmen | Nafarroa | ARALAR | Exacta (~25m) | | | |
| OTADIZULO* | Cromlech | Gipuzkoa | ARALAR | Exacta (~25m) | Nahiko egoera onean | | |
| OTAGAIN | Dolmen | Asteasu | ERNIO | Exacta (~25m) | | | |
| OTAL | Túmulo | | Valle de ORDESA | | | | |
| Otal 1 | Cromlech | | Valle de ORDESA | Exacta (~25m) | | | |
| OTALTZU 1 ekialde | Dolmen | Nafarroa | BERTIZ - ARANA | Exacta (~25m) | | | |
| OTALTZU 2 mendebal | Dolmen | Nafarroa | BERTIZ - ARANA | Exacta (~25m) | | | |
| OTALTZUAZPIA | Dolmen | Nafarroa | BERTIZ - ARANA | Exacta (~25m) | | | |
| OTAMUNUETA | Campo tumular | | LARRAUN | Exacta (~25m) | | | |
| OTANARTEKO LEPOA | Cista | | OTSONDO – IPARLA | Exacta (~25m) | | | |
| OTANARTEKO LEPOA | Cromlech | | OTSONDO – IPARLA | Exacta (~25m) | | | |
| OTANARTEKO BIZKARRA* | Menhir | | OTSONDO – IPARLA | Exacta (~25m) | | | |
| OTANSUR | Dolmen | Nafarroa | ARALAR | Exacta (~25m) | | | |
| OTARRA BIZKARRA | Cromlech | Nafarroa | ALBA - KINTO | Exacta (~25m) | | | |
| OTATZA 1 | Túmulo | | MONTES DE ITURRIETA | Exacta (~25m) | | | |
| OTATZA 2 | Túmulo | | MONTES DE ITURRIETA | Exacta (~25m) | | | |
| OTEGI | Dolmen | Nafarroa | AURITZ - ERRO | Exacta (~25m) | | | |
| OTEIXON | Dolmen | | BERTIZ - ARANA | Exacta (~25m) | | | |
| OTEIXON 1 | Menhir | Bertizarana | BERTIZ - ARANA | Exacta (~25m) | Oso kaltetuta | | |
| OTEIXON 2 | Menhir | Bertizarana | BERTIZ - ARANA | Exacta (~25m) | Oso kaltetuta | | |
| OTEIXON 3 | Menhir | Bertizarana | BERTIZ - ARANA | Exacta (~25m) | Oso kaltetuta | | |
| OTEIXON 4 | Menhir | Bertizarana | BERTIZ - ARANA | Exacta (~25m) | Oso kaltetuta | | |
| OTHAMUNHO* | Dolmen | | BEORLEGI | Destruído | Suntsitua | | |
| OTSAARTE | Dolmen | Gipuzkoa | ALTZANIA | Exacta (~25m) | | | |
| OTSABIO | Dolmen | Gipuzkoa | OTSABIO - ZARATE | Exacta (~25m) | Oso kaltetuta | | |
| Otsagarate | Fondo de cabaña | Urbasa | URBASA | Exacta (~25m) | | | |
| Otsagarate 1 | Túmulo | Urbasa | URBASA | Exacta (~25m) | | | |
| Otsagarate 10 | Túmulo | Urbasa | URBASA | Exacta (~25m) | | | |
| Otsagarate 11 | Túmulo | Urbasa | URBASA | Exacta (~25m) | | | |
| Otsagarate 12 | Túmulo | Urbasa | URBASA | Exacta (~25m) | | | |
| Otsagarate 13 | Túmulo | Urbasa | URBASA | Exacta (~25m) | | | |
| Otsagarate 14 | Túmulo | Urbasa | URBASA | Exacta (~25m) | | | |
| Otsagarate 2 | Túmulo | Urbasa | URBASA | Exacta (~25m) | | | |
| Otsagarate 3 | Túmulo | Urbasa | URBASA | Exacta (~25m) | | | |
| Otsagarate 4 | Túmulo | Urbasa | URBASA | Exacta (~25m) | | | |
| Otsagarate 5 | Túmulo | Urbasa | URBASA | Exacta (~25m) | | | |
| Otsagarate 6 | Túmulo | Urbasa | URBASA | Exacta (~25m) | | | |
| Otsagarate 7 | Túmulo | Urbasa | URBASA | Exacta (~25m) | | | |
| Otsagarate 8 | Túmulo | Urbasa | URBASA | Exacta (~25m) | | | |
| Otsagarate 9 | Túmulo | Urbasa | URBASA | Exacta (~25m) | | | |
| OTSANGO | Túmulo | Nafarroa | GOIZUETA-ARTIKUTZA-ARANTZA | Exacta (~25m) | Oso kaltetuta | | |
| Otsaportillo | Túmulo | Urbasa | URBASA | Exacta (~25m) | | | |
| OTSAPORTILLO 1 ipar | Menhir | Urbasa | URBASA | Exacta (~25m) | Nahiko egoera onean | | |
| OTSAPORTILLO 2 hego | Menhir | | URBASA | Exacta (~25m) | | | |
| OTSAPORTILLO 3 erdi | Menhir | Urbasa | URBASA | Exacta (~25m) | | | |
| OTSAPORTILLO 4 | Menhir | | URBASA | Exacta (~25m) | Nahiko egoera onean | | |
| OTSAPORTILLO 6 | Túmulo anular | Urbasa | URBASA | Exacta (~25m) | Nahiko egoera onean | | |
| Otsaportillo 7 | Túmulo anular | | URBASA | Exacta (~25m) | | | |
| OTSAPORTILLOKO BIDEGURUTZEA | Túmulo | Nafarroa | URBASA | Exacta (~25m) | | | |
| OTSARRI 1 | Menhir | Orbaizeta | URKULU – IRATI | Exacta (~25m) | Oso kaltetuta | | |
| OTSARRI 2 | Menhir | | URKULU – IRATI | Exacta (~25m) | Oso kaltetuta | | |
| OTSAZULO | Túmulo anular | | ANDIA | Exacta (~25m) | | | |
| OTSOARRISKO ZELAIA | Cromlech | Nafarroa | URKULU – IRATI | Exacta (~25m) | Nahiko egoera onean | | |
| OTSOBASO | Dolmen | | GORBEIA | Exacta (~25m) | | | |
| Otsoleize | Túmulo | | ARALAR | Exacta (~25m) | | | |
| OTSOLEPO | Dolmen | Gipuzkoa | ONDDI - ADARRA - MANDOEGI | Exacta (~25m) | | | |
| OTSOLLAGA | Dolmen | Nafarroa | URKIAGA – ADI | Exacta (~25m) | | | |
| OTSONDO | Cromlech | Nafarroa | LEGATE - ALKURRUNTZ | Exacta (~25m) | | | |
| OTSONDO 1 ipar * | Dolmen | Nafarroa | OTSONDO – IPARLA | Exacta (~25m) | Suntsitua | | |
| OTSONDO 2 hego | Dolmen | Nafarroa | OTSONDO – IPARLA | Exacta (~25m) | Oso kaltetuta | | |
| OTSOPASAJE | Dolmen | Nafarroa | ARALAR | Exacta (~25m) | | | |
| OTSOTESARE 1 ekialde | Dolmen | Nafarroa | ARALAR | Exacta (~25m) | | | |
| Otsotesare 2 * (Destruido) | Dolmen | Nafarroa | ARALAR | Destruído | | | |
| OTXOGORRITXIPIA | Túmulo | Nafarroa | LARRAU - OTSOGORRIGAÑA | Aproximada (~200m) | | | |
| OTXOLATZE | Túmulo | | ETXEKORTIA - OLATXE | Exacta (~25m) | | | |
| OURATOU | Cromlech | Bearn | ASPE | Exacta (~25m) | | | |
| OURDINSE | Cromlech | Bearn | ASPE | | | | |
| OURREC 1 | Dolmen | | Ezezaguna | Exacta (~25m) | Oso kaltetuta | | |
| OURREC 10 | Cromlech | | Ezezaguna | Exacta (~25m) | Oso kaltetuta | | |
| OURREC 2 | Cromlech | | Ezezaguna | Exacta (~25m) | Oso kaltetuta | | |
| OURREC 3 | Menhir | Hautes-Pyrénées | Ezezaguna | Exacta (~25m) | Oso kaltetuta | | |
| OURREC 4 | Túmulo | | Ezezaguna | Exacta (~25m) | Oso kaltetuta | | |
| OURREC 5 | Túmulo | Hautes-Pyrénées | Ezezaguna | Exacta (~25m) | Oso kaltetuta | | |
| OURREC 6 | Dolmen | Hautes-Pyrénées | Ezezaguna | Exacta (~25m) | Oso kaltetuta | | |
| OURREC 7 | Dolmen | | Ezezaguna | Exacta (~25m) | Oso kaltetuta | | |
| OURREC 8 | Dolmen | Hautes-Pyrénées | Ezezaguna | Exacta (~25m) | Oso kaltetuta | | |
| OURREC 9 | Dolmen | Hautes-Pyrénées | Ezezaguna | Exacta (~25m) | Oso kaltetuta | | |
| OZAETABASO 1 | Túmulo | Barrundia | SIERRAS DE ELGEA - URKILLA | Exacta (~25m) | Oso kaltetuta | | |
| OZAETABASO 2 | Túmulo | Barrundia | SIERRAS DE ELGEA - URKILLA | Exacta (~25m) | Oso kaltetuta | | |
| PADARGAN | Túmulo | Araba | VALLE DE ZUIA | Exacta (~25m) | Nahiko egoera onean | | |
| PAGABE | Fondo de cabaña | Gipuzkoa | ARALAR | Aproximada (~200m) | | | |
| PAGAMENDI | Dolmen | Nafarroa | LARRAUN | Exacta (~25m) | Oso kaltetuta | | |
| PAGANDUL | Fondo de cabaña | | ERNIO | Exacta (~25m) | Egoera onean | | |
| PAGANDUL II | Túmulo | | ERNIO | Exacta (~25m) | Nahiko egoera onean | | |
| PAGARRETA | Dolmen | Gipuzkoa | AITZKORRI - URBIA | Exacta (~25m) | | | |
| Pagarreta II | Menhir | Euskal Herria, Gipuzkoa | AITZKORRI - URBIA | Exacta (~25m) | Egoera onean | | |
| PAGAZABAL 2 mendebal | Dolmen | Bizkaia | URKIOLAMENDI | Exacta (~25m) | | | |
| PAGAZABAL ekialde | Túmulo | Bizkaia | URKIOLAMENDI | Exacta (~25m) | | | |
| PAGAZAHARRETA 1 | Cromlech | Lekorne | URTZUIA | Exacta (~25m) | Oso kaltetuta | | |
| PAGAZAHARRETA 1 | Menhir | Lekorne | URTZUIA | Exacta (~25m) | Oso kaltetuta | | |
| PAGAZAHARRETA 1 | Túmulo | Lekorne | URTZUIA | Exacta (~25m) | Oso kaltetuta | | |
