Although each landscape has its own identity, only some of them are recognized as nationally important because of their cultural and natural values and their contribution to national identity. In Slovenia, these landscapes are listed in the national Spatial Development Strategy (adopted in 2004). However, this list was neither supported by implementation instruments nor integrated in any conservation or management policy documents and was poorly integrated into spatial plans. The aim of this research was to renew the methodology for identifying landscapes of national importance. The methods included in-depth interviews with experts, an online questionnaire, participatory workshops, and field visits. The questionnaire results showed that only eight landscapes from the original list of 62 were explicitly recognized as nationally important, which confirmed the hypothesis that the initial method was not transparent and that the criteria were biased. The proposed approach included the following criteria: (1) representativeness, (2) the quality of the landscape features, and (3) the cultural and scientific value. The methodology was accompanied with the list of landscape features and landscape types that are important for Slovenian national identity; recommendations for implementing the method on national, regional, and local levels; and the general guidelines for spatial planning and management of these landscapes.