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We discuss the goals, the designs, the state of technical readiness, and thecritical R&D needs of the accelerators that are currently under discussion asHiggs and electroweak factories. We also address the respective staging optionsenabling future energy-frontier colliders. The accelerators covered are basedon many different techniques and approaches. They include several circularcolliders, various linear colliders, colliders based on energy recovery linacs(ERLs), ERL-ring combinations, as well as gamma-gamma colliders. The linearcolliders proposed consist of options for the International Linear Collider(ILC), for the Compact Linear Collider (CLIC), for the Cold Copper Collider(C^3), and for the more recent Higgs-Energy Lepton Collider (HELEN). ERLs arekey components of the Recycling Linear e+e- Collider (ReLiC), of the EnergyRecovery Linear Collider (ERLC), and of the Circular Energy Recovery Collider(CERC). Among the more conventional ring colliders, the following proposals arefeatured: the Future Circular Collider (FCC-ee), the Circular Electron PositronCollider (CEPC), the Electron Positron Circular Collider at Fermilab (EPCCF),and the Large Electron Positron collider $\#$3 (LEP-3). In addition, weconsider the X-ray FEL based gamma-gamma Collider Higgs Factory (XCC) and theHigh-Energy High-Luminosity gamma-gamma collider (HE&HL gamma-gamma). Finally,a Higgs factory based on a circular muon collider is mentioned forcompleteness.

Accelerators for Electroweak Physics and Higgs Boson Studies