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<jats:title>ABSTRACT</jats:title> <jats:p>AE Aquarii (AE Aqr) is a cataclysmic binary hosting one of the fastest rotating (<jats:inline-formula> <jats:tex-math> <?CDATA ${P}_{\mathrm{spin}}$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjaa3c3aieqn1.gif" xlink:type="simple" /> </jats:inline-formula> = 33.08 s) white dwarfs (WDs) known. Based on seven years of <jats:italic>Fermi</jats:italic> Large Area Telescope (LAT) Pass 8 data, we report on a deep search for gamma-ray emission from AE Aqr. Using X-ray observations from <jats:italic>ASCA</jats:italic>, <jats:italic>XMM-Newton</jats:italic>, <jats:italic>Chandra</jats:italic>, <jats:italic>Swift</jats:italic>, <jats:italic>Suzaku</jats:italic>, and <jats:italic>NuSTAR</jats:italic>, spanning 20 years, we substantially extend and improve the spin ephemeris of AE Aqr. Using this ephemeris, we searched for gamma-ray pulsations at the spin period of the WD. No gamma-ray pulsations were detected above 3<jats:italic>σ</jats:italic> significance. Neither phase-averaged gamma-ray emission nor gamma-ray variability of AE Aqr is detected by <jats:italic>Fermi</jats:italic> LAT. We impose the most restrictive upper limit to the gamma-ray flux from AE Aqr to date: <jats:inline-formula> <jats:tex-math> <?CDATA $1.3\times {10}^{-12}$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjaa3c3aieqn2.gif" xlink:type="simple" /> </jats:inline-formula> erg cm<jats:sup>−2</jats:sup> s<jats:sup>−1</jats:sup> in the 100 MeV–300 GeV energy range, providing constraints on models.</jats:p>