K99 or K-99 may refer to:
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K-99 (Kansas highway)
K-99 is a state highway in the U.S. state of Kansas. The highway runs from Oklahoma State Highway 99 (SH-99) at the Oklahoma state line near Chautauqua north to Nebraska Highway 99 (N-99) at the Nebraska state line in Summerfield. K-99 connects ...
, a state highway in Kansas
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HMS Gardenia (K99), a former UK Royal Navy ship
{{Letter-number combination disambiguation