  A significant benchmark for discovery at a proton-proton collider is the
sensitivity to a dijet resonance, X, the intermediate state of the s-channel
process $pp \rightarrow X \rightarrow 2\mbox{ jets}$. To probe the highest
resonance masses, hadron collider experiments have used the classic technique
of searching for bumps in the mass spectrum of two individually resolved jets.
In this Snowmass 2021 study, we explore the search sensitivity to multiple
benchmark models of dijet resonances at current and future proton-proton
colliders. We present the expected masses for $5\sigma$ discovery and 95\%
confidence level exclusion of diquarks, colorons, excited quarks,
$W^{\prime}s$, $Z^{\prime}s$ and Randall-Sundrum gravitons, resulting from
accumulation of integrated luminosities between 10 and $10^5$ fb$^{-1}$, at
proton-proton colliders operating at energies $\sqrt{s}=$ 13, 14, 27, 75, 100,
150, 300 and 500 TeV.
