Most countries do not have an emission inventory for non-road mobile machinery. Existing inventories are usually based on assumptions, with little available data, due to various factors: a large number of machinery type, a large variety of internal combustion engines installed in non-road mobile machinery, lack of activity data etc. In this paper, an emission inventory for machinery used in forestry in Croatia is developed. Since there is no available data on the machinery, a survey was conducted. Data on fuel consumption based on fuel type and machinery type were gathered. The data were processed and, using weight factors provided by the Croatian Bureau of Statistics, shown on a national level. The results are shown for two main fuel types, gasoline and diesel fuel. The resulting emission inventory is compared to emissions from road vehicles in Croatia by emission type per gigajoule of energy spent. Results show that most emissions come from tractors, forwarders and construction work machines and indicate that the proportion of emissions of non-road mobile machinery used in forestry, compared to road transport, is considerably larger than their respective proportion of energy consumption (up to 41 times).