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In this letter, we report the discovery of the highest redshift, heavilyobscured, radio-loud AGN candidate selected using JWST NIRCam/MIRI, mid-IR,sub-mm, and radio imaging in the COSMOS-Web field. Using multi-frequency radioobservations and mid-IR photometry, we identify a powerful, radio-loud (RL),growing supermassive black hole (SMBH) with significant spectral steepening ofthe radio SED ($f_{1.28 \mathrm{GHz}} \sim 2$ mJy, $q_{24\mu m} = -1.1$,$\alpha_{1.28-3\mathrm{GHz}}=-1.2$, $\Delta \alpha = -0.4$). In conjunctionwith ALMA, deep ground-based observations, ancillary space-based data, and theunprecedented resolution and sensitivity of JWST, we find no evidence of AGNcontribution to the UV/optical/NIR data and thus infer heavy amounts ofobscuration (N$_{\mathrm{H}} > 10^{23}$ cm$^{-2}$). Using the wealth of deep UVto sub-mm photometric data, we report a singular solution photo-z of$z_\mathrm{phot}$ = 7.7$^{+0.4}_{-0.3}$ and estimate an extremely massivehost-galaxy ($\log M_{\star} = 11.4 -12\,\mathrm{M}_{\odot}$) hosting apowerful, growing SMBH (L$_{\mathrm{Bol}} = 4-12 \times 10^{46}$ erg s$^{-1}$).This source represents the furthest known obscured RL AGN candidate, and itslevel of obscuration aligns with the most representative but observationallyscarce population of AGN at these epochs.

Uncovering a Massive z~7.7 Galaxy Hosting a Heavily Obscured Radio-Loud QSO Candidate in COSMOS-Web