Welcome to the Fjord5G Zenodo repository! The Fjord5G is a 5G dataset for coastal maritime connectivity research. We conduct an extensive measurement campaign aboard research and public ferries in the Kiel Fjord, Germany, collecting GPS-located cellular data along maritime routes. These measurements cover the network conditions encountered in coastal and near-shore regions and provide insights into metrics such as signal strength, modulation, and bandwidth. The resulting dataset includes cellular measurements at a sampling rate of 1 Hz from two mobile network operators, four 5G routers, and two ferries for up to 12 months per router. Check out the supplied Jupyter Notebooks to analyze the data in our Fjord5G GitHub repo. The paper is accepted at the 2025 IEEE 101st Vehicular Technology Conference: VTC2025-Spring. This project is licensed under the terms of the Creative Commons Attribution 4.0 International License.