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We report the discovery of TOI-4641b, a warm Jupiter transiting a rapidlyrotating F-type star with a stellar effective temperature of 6560 K. The planethas a radius of 0.73 $R_{Jup}$, a mass smaller than 3.87 $M_{Jup}$ $(3\sigma)$,and a period of 22.09 days. It is orbiting a bright star (V=7.5 mag) on acircular orbit with a radius and mass of 1.73 $R_{\odot}$ and 1.41 $M_{\odot}$.Follow-up ground-based photometry was obtained using the Tierras Observatory.Two transits were also observed with the Tillinghast Reflector EchelleSpectrograph (TRES), revealing the star to have a low projected spin-orbitangle ($\lambda$=$1.41^{+0.76}_{-0.76}$ degrees). Such obliquity measurementsfor stars with warm Jupiters are relatively few, and may shed light on theformation of warm Jupiters. Among the known planets orbiting hot andrapidly-rotating stars, TOI-4641b is one of the longest-period planets to bethoroughly characterized. Unlike hot Jupiters around hot stars which are moreoften misaligned, the warm Jupiter TOI-4641b is found in a well-aligned orbit.Future exploration of this parameter space can add one more dimension to thestar-planet orbital obliquity distribution that has been well-sampled for hotJupiters.

TOI-4641b: An Aligned Warm Jupiter Orbiting a Bright (V=7.5) Rapidly Rotating F-star