  We present the discovery of a transiting hot Jupiter orbiting HIP 67522
($T_{eff}\sim5650$ K; $M_* \sim 1.2 M_{\odot}$) in the 10-20 Myr old Sco-Cen OB
association. We identified the transits in the TESS data using our custom
notch-filter planet search pipeline, and characterize the system with
additional photometry from Spitzer, spectroscopy from SOAR/Goodman, SALT/HRS,
LCOGT/NRES, and SMARTS/CHIRON, and speckle imaging from SOAR/HRCam. We model
the photometry as a periodic Gaussian process with transits to account for
stellar variability, and find an orbital period of
6.9596$^{+0.000016}_{-0.000015}$ days and radius of 10.02$^{+0.54}_{-0.53}$
R$_\oplus$. We also identify a single transit of an additional candidate planet
with radius 8.01$^{+0.75}_{-0.71}$ R$_\oplus$ that has an orbital period of
$\gtrsim23$ days. The validated planet HIP 67522 b is currently the youngest
transiting hot Jupiter discovered and is an ideal candidate for transmission
spectroscopy and radial velocity follow-up studies, while also demonstrating
that some young giant planets either form in situ at small orbital radii, or
else migrate promptly from formation sites farther out in the disk.
