The Zwicky Transient Facility has begun to discover binary systems with orbital periods that are less than 1,hr. Combined with dedicated follow-up systems, which allow for high-cadence photometry of these sources, systematic confirmation and characterization of these sources are now possible. Here, we report the discovery of ZTF J190125.42+530929.5, a 40.6,min orbital period, eclipsing double white-dwarf binary. Both photometric and spectroscopic modeling confirm its nature, yielding an estimated inclination of $i = 86.2^{+0.6}_{-0.2},rm degrees$ and primary and secondary effective temperatures of $textrm{T}_textrm{eff} = 28,000^{+500}_{-500},K$ and $textrm{T}_textrm{eff} = 17,600^{+400}_{-400},K$ respectively. This system adds to a growing list of sources for future gravitational-wave detectors and contributes to the demographic analysis of double degenerates.
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