By the end of 2016, the American network will offer Spanish residents a web-only channel, expanding a service it already offers in Sweden, Norway, Finland and Denmark.
The stand-alone web service is an attempt to woo "cord-cutters" – a term used for those who ditch pay-TV subrscriptions and instead view over internet streaming.
With its new offering HBO, which is owned by Time Warner, will retain exclusive rights to its shows meaning fans of hit series such as Game of Thrones, True Detective and Girls will have to sign up for future seasons.
Simon Sutton, HBO's president of international and content distribution, confirmed the plans to Bloomberg but wouldn't comment on the details.
Netflix launched across Spain in October providing a service costing from €7.99 per month and offering originals such as House of Cards and Orange is the New Black.