The globally accepted concept of a bioeconomy includes the field of forestry; however, the concept of a forest bioeconomy (FBE) does not appear to be defined uniformly. The concepts of bioeconomy and sustainable development are interlinked. In many countries, the bioeconomy is often the subject of efforts to quantify it from the state level, and therefore, the question arises as to whether the data regarding the financial support of an FBE in individual countries can be considered mutually comparable, with the aim of including them, for example, among the criteria for measuring sustainability (e.g., indicators of sustainable development—SDI). This option has political implications for political representation, taking the form of a comparable indicator in the approaches of individual states. This article analytically compares FBEs and our understanding of them in selected countries: Czechia, Slovakia, Finland, Italy, and Germany. Czechia financially supports various areas of forestry through European funds (Rural Development Programme, RDP CZ). In this article, we assess this support from the point of view of the perceptions of the FBE in the studied states, with an emphasis on the view of Czechia. First, an FBE analysis of the selected official and supporting documents of the studied countries was performed. The total financial data from the supported projects from the RDP CZ were subsequently assigned to these areas. Thus, the idea of financial support for the FBE through the RDP CZ from the perspectives of the selected countries was born. The differences in the perception of the FBE according to the description derived from the analysis were also confirmed by the different financial quantifications (hypothetical) of these different views. The obtained results demonstrate an incomparable state of perception of the FBE among the selected countries. For these reasons, it is currently inappropriate to use the level of FBE financial support to measure sustainability.