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{{#invoke:Infobox|infobox}} 37 Fides ({{#invoke:IPAc-en|main}} FY-deez) is a large main-belt asteroid. It was discovered by German astronomer Karl Theodor Robert Luther on October 5, 1855,<ref name="IAU_MPC"/> and named after Fides, the Roman goddess of loyalty. Fides was the last of the main-belt asteroids to be assigned an iconic symbol.<ref name="Gould1852"/> 37 Fides is also a S-type asteroid in the Tholen classification system.<ref name="JPL"/>

Photometric observations of this asteroid at multiple observatories during 1981–82 gave an unusual light curve with three minima and maxima. The curve changed with varying phase angle of the asteroid relative to the viewer and the position of the Sun, indicating the changing influence of shadows cast by surface features. The composite light curve has a best fit period estimate of 7.33 hours.<ref name="Zappla1983"/> Austrian astronomer Hans Josef Schober has suggested that the multiple minima and maxima during each period may be an indication of a binary nature.<ref name="Schober1984"/>


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