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We report the discovery of an extended very-high-energy (VHE) gamma-raysource around the location of the middle-aged (207.8 kyr) pulsar PSR J0622+3749with the Large High Altitude Air Shower Observatory (LHAASO). The source isdetected with a significance of $8.2\sigma$ for $E>25$~TeV assuming a Gaussiantemplate. The best-fit location is (R.A.,Dec.)$=(95^{\circ}\!.47\pm0^{\circ}\!.11,\,37^{\circ}\!.92 \pm0^{\circ}\!.09)$,and the extension is $0^{\circ}\!.40\pm0^{\circ}\!.07$. The energy spectrum canbe described by a power-law spectrum with an index of ${-2.92 \pm 0.17_{\rmstat} \pm 0.02_{\rm sys} }$. No clear extended multi-wavelength counterpart ofthe LHAASO source has been found from the radio to sub-TeV bands. The LHAASOobservations are consistent with the scenario that VHE electrons escaped fromthe pulsar, diffused in the interstellar medium, and scattered the interstellarradiation field. If interpreted as the pulsar halo scenario, the diffusioncoefficient, inferred for electrons with median energies of $\sim160$~TeV, isconsistent with those obtained from the extended halos around Geminga andMonogem and much smaller than that derived from cosmic ray secondaries. TheLHAASO discovery of this source thus likely enriches the class of so-calledpulsar halos and confirms that high-energy particles generally diffuse veryslowly in the disturbed medium around pulsars.

Extended Very-High-Energy Gamma-Ray Emission Surrounding PSR J0622 + 3749 Observed by LHAASO-KM2A