Abstract: International audience ; A measurement of the atmospheric $\nu_{\mu}+\bar{\nu}_{\mu}$ flux with energies between 1--100 GeV is presented. The measurement has been performed using data taken with the first six detection units of the KM3NeT/ORCA detector, referred to as ORCA6. The data were collected between January 2020 and November 2021 and correspond to 510 days of livetime, with a total exposure of 433 kton$\cdot$years. Using machine learning classification, 3894 neutrino candidate events have been selected with an atmospheric muon contamination of less than 1$\%$. The atmospheric $\nu_{\mu}+\bar{\nu}_{\mu}$ energy spectrum is derived using an unfolding procedure and the impact of systematic uncertainties is estimated. The atmospheric $\nu_{\mu}+\bar{\nu}_{\mu}$ flux measured using the ORCA6 configuration is in agreement with the values measured by other experiments.
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