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While the population of confirmed exoplanets continues to grow, the sample ofconfirmed transiting planets around evolved stars is still limited. We presentthe discovery and confirmation of a hot Jupiter orbiting TOI-2184 (TIC176956893), a massive evolved subgiant ($M_\star= 1.53 \pm 0.12 M_\odot$,$R_\star= 2.90 \pm 0.14 R_\odot$) in the $\textit{TESS}$ Southern ContinuousViewing Zone. The planet was flagged as a false positive by the $\textit{TESS}$Quick-Look Pipeline due to periodic systematics introducing a spurious depthdifference between even and odd transits. Using a new pipeline to removebackground scattered light in $\textit{TESS}$ Full Frame Image (FFI) data, wecombine space-based $\textit{TESS}$ photometry, ground-based photometry, andground-based radial velocity measurements to report a planet radius of $R_p=1.017 \pm 0.051 R_J$ and mass of $M_p= 0.65 \pm 0.16 M_J$. For a planet soclose to its star, the mass and radius of TOI-2184b are unusually well matchedto those of Jupiter. We find that the radius of TOI-2184b is smaller thantheoretically predicted based on its mass and incident flux, providing avaluable new constraint on the timescale of post-main-sequence planetinflation. The discovery of TOI-2184b demonstrates the feasibility of detectingplanets around faint ($\textit{TESS}$ magnitude $>12$) post-main sequence starsand suggests that many more similar systems are waiting to be detected in the$\textit{TESS}$ FFIs, whose confirmation may elucidate the final stages ofplanetary system evolution.

$\textit{TESS}$ Giants Transiting Giants I: A Non-inflated Hot Jupiter Orbiting a Massive Subgiant