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We present mid-infrared photometry and measured global properties of the 100largest galaxies in the sky, including the Magellanic Clouds, Local Groupgalaxies M31 and M33, the Fornax and Virgo Galaxy Cluster giants, and many ofthe most spectacular Messier objects (e.g., M51 and M83). This is the firstrelease of a larger catalog of extended sources as imaged in the mid-infrared,called the WISE Extended Source Catalogue (WXSC). In this study we measuretheir global attributes, including integrated flux, surface brightness andradial distribution. The largest of the large are the LMC, SMC and theAndromeda Galaxy, which are also the brightest mid-infrared galaxies in thesky. We interrogate the large galaxies using WISE colors, which serve asproxies for four general types of galaxies: bulge-dominated spheroidals,intermediate semi-quiescent disks, star-forming spirals, and AGN-dominated. Thecolors reveal a tight "sequence" that spans 5 magnitudes in W2-W3 color,ranging from early to late-types, and low to high star-forming activity; we fitthe functional form given by: ${\rm (W1-W2)} = [0.015 \times {\rm e}^{\frac{{\rm (W2-W3)}}{1.38} }] - 0.08$. Departures from this sequence may revealnuclear, starburst, and merging events. Physical properties and luminosityattributes are computed, notably the diameter, aggregate stellar mass and thedust-obscured star formation activity. We introduce the 'pinwheel' diagramwhich depicts physical properties with respect to the median value observed forWISE galaxies in the local universe. Utilized with the WXSC, this diagram willdelineate between different kinds of galaxies, identifying those with similarstar formation and structural properties. Finally, we present the mid-infraredphotometry of the 25 brightest globular clusters in the sky, including OmegaCentauri, 47 Tucanae and a number of famed night-sky targets (e.g. M 13).(Abridged)

The WISE Extended Source Catalogue (WXSC) I: The 100 Largest Galaxies