The aim of this study, conducted in 2018 and 2019 years under the ecological conditions of Eskisehir. was to determine the content and components of essential oils obtained from four different organs (stems, leaves, flowers and green fruits) of fennel (Foeniculum vulgare Mill.). The field experiments were designed as randomized complete block design with four replications. The results showed that, as an average of two years. t he essential oil content in stems, leaves, flowers and dried green fruits were 1.10%, 2.49%. 5.51% and 5.75%, respectively. In essential oils obtained from stems, flowers and fruits, methylchavicol (40.06%, 71.06% and 71.67%), respectively was determined as the main component, while in essential oil obtained from leaves, limonene (41.34%) was the main compound. The data obtained from the study showed that essential oil contents and the chemical composition of essential oils differ depending on the plant's different organs.