Turbulent fluxes of momentum, heat, water vapor, and CO₂ were measured in 2019 at the Arctic DASAN Station in Ny-Ålesund, Svalbard. An eddy covariance system consisting of a 3-D sonic anemometer and an open-path CO₂/H₂O gas analyzer was used for the measurements. A CR1000X data logger (software version: CR1000X.Std.06.02) was used to record the raw data at a sampling rate of 10 Hz. The processed data cover the period from January 1, 2019, 00:30 UTC to November 1, 2019, 00:00 UTC and are provided at 30-minute intervals. The dataset includes momentum flux (Tau, kg m⁻¹ s⁻²), sensible heat flux (H, W m⁻²), latent heat flux (LE, W m⁻²), CO₂ flux (co2_flux, µmol s⁻¹ m⁻²), H₂O flux (h2o_flux, mmol s⁻¹ m⁻²), sonic temperature (sonic_temperature, K), air temperature (air_temperature, K), atmospheric pressure (air_pressure, Pa), air density (air_density, kg m⁻³), water vapor density (water_vapor_density, kg m⁻³), vapor pressure (e, Pa), saturation vapor pressure (es, Pa), relative humidity (RH, %), vapor pressure deficit (VPD, Pa), dew point temperature (Tdew, K), three-dimensional wind components (wind_u, wind_v, and wind_w, m s⁻¹), wind speed (wind_speed, m s⁻¹), wind direction (wind_direction, deg_from_north), and other related variables.