List of asteroids/21801–21900

|| October 6, 1999 || Modra || L. Kornoš, J. Tóth
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21803 - || || October 8, 1999 || Višnjan Observatory || K. Korlević, M. Jurić
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21806 - || || October 14, 1999 || Xinglong || Beijing Schmidt CCD Asteroid Program
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21809 - || || October 5, 1999 || Goodricke-Pigott || R. A. Tucker
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21812 - || || October 3, 1999 || Socorro || LINEAR
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21815 Fanyang || || October 4, 1999 || Socorro || LINEAR
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21818 Yurkanin || || October 2, 1999 || Socorro || LINEAR
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21821 Billryan || || October 9, 1999 || Kitt Peak || Spacewatch
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21824 - || || October 2, 1999 || Socorro || LINEAR
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21827 Chingzhu || || October 2, 1999 || Socorro || LINEAR
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21830 - || || October 2, 1999 || Socorro || LINEAR
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21833 - || || October 2, 1999 || Socorro || LINEAR
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21836 - || || October 2, 1999 || Socorro || LINEAR
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21839 - || || October 2, 1999 || Socorro || LINEAR
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21842 - || || October 4, 1999 || Socorro || LINEAR
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21845 - || || October 4, 1999 || Socorro || LINEAR
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21848 - || || October 7, 1999 || Socorro || LINEAR
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21851 - || || October 7, 1999 || Socorro || LINEAR
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21854 Brendandwyer || || October 7, 1999 || Socorro || LINEAR
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21857 - || || October 10, 1999 || Socorro || LINEAR
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21860 Joannaguy || || October 12, 1999 || Socorro || LINEAR
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21863 - || || October 8, 1999 || Catalina || CSS
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21866 - || || October 10, 1999 || Socorro || LINEAR
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21869 - || || October 17, 1999 || Višnjan Observatory || K. Korlević
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21872 - || || October 18, 1999 || Xinglong || Beijing Schmidt CCD Asteroid Program
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21875 - || || October 31, 1999 || Kitt Peak || Spacewatch
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21878 - || || October 29, 1999 || Catalina || CSS
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21881 - || || October 28, 1999 || Catalina || CSS
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21884 - || || October 31, 1999 || Kitt Peak || Spacewatch
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21887 Dipippo || || October 29, 1999 || Kitt Peak || Spacewatch
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21890 - || || November 1, 1999 || Kitt Peak || Spacewatch
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21893 - || || November 5, 1999 || Višnjan Observatory || K. Korlević
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21896 - || || November 7, 1999 || Višnjan Observatory || K. Korlević
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21899 - ||