Determination of the direct double-β decay Q value of 96 Zr and atomic masses of [90][91][92]94,96 Experimental searches for the neutrinoless double-β decay offer one of the best opportunities to look for physics beyond the Standard Model. Detecting this decay would confirm the Majorana nature of the neutrino, and a measurement of its half-life can be used to determine the absolute neutrino mass scale. Important to both tasks is an accurate knowledge of the Q value of the double-β decay. The LEBIT Penning trap mass spectrometer was used for the first direct experimental determination of the 96 Zr double-β decay Q value: Q ββ = 3355.85 (15) keV. This value is nearly 7 keV larger than the 2012 atomic mass evaluation [Chin. Phys. C 36, 1603 (2012)