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We report a $30~\mathrm{ks}$ $Chandra$ ACIS-S survey of the globular clusterM3. Sixteen X-ray sources were detected within the half-light radius ($2.3'$)with $L_X \gtrsim 2.3 \times 10^{31}~\mathrm{erg~s^{-1}}$. We used$Hubble~Space~Telescope$ WFC3/UVIS and ACS/WFC images to find 10 plausibleoptical/UV counterparts. We fit the spectral energy distribution of the knowncataclysmic variable 1E1339.8+2837 with a blue ($T_\mathrm{eff} =2.10^{+1.96}_{-0.58}\times 10^4~\mathrm{K}$, 90% conf.) spectral component froman accretion disc, plus a red component ($T_\mathrm{eff} =3.75_{-0.15}^{+1.05}\times 10^3~\mathrm{K}$) potentially from a subgiant donor.The second brightest source (CX2) has a soft blackbody-like spectrum suggestinga quiescent low-mass X-ray binary (qLMXB) containing a neutron star. Six newcounterparts have obvious UV and/or blue excesses, suggesting a cataclysmicvariable (CV) or background active galactic nucleus (AGN) nature. Two (CX6 andCX8) have proper motions indicating cluster membership, suggesting a CV nature.CX6 is blue in UV filters but red in V-I, which is difficult to interpret. TwoCV candidates, CX7 and CX13, show blue excesses in B-V colour but were notdetected in the UV. The other two CV candidates were only detected in the twoUV bands ($\mathrm{UV_{275}}$ and $\mathrm{NUV_{336}}$), so do not have propermotion measurements, and may well be AGNs. One $Chandra$ source can beconfidently identified with a red straggler (a star redward of the giantbranch). The observed X-ray source population of M3 appears consistent with itspredicted stellar interaction rate.

Identifications of Faint Chandra Sources in the Globular Cluster M3