Buttonville Municipal Airport or Toronto/Buttonville Municipal Airport, (IATA: YKZ, ICAO: CYKZ), is a medium-sized airport in Buttonville, Ontario, Canada, within Markham and 29 km north of downtown Toronto. It is operated by Toronto Airways Limited. Due to its proximity to Toronto's suburbs, there are several strict noise-reduction procedures for aircraft using the airport. There is a weather station located at the airport. The airport is open and staffed 24 hours a day, 365 days a year. In 2007, Buttonville was Canada's 8th busiest airport by aircraft movements.

The airport is classifed as an airport of entry by NAV CANADA and is staffed by the Canada Border Services Agency. CBSA officers at this airport currently can handle general aviation aircraft only, with no more than 15 passengers.

There are three non-precision instrument approaches available: a Global Positioning System (GPS) approach to runway 33, a non-directional beacon (NDB) approach to runway 21, and a localizer approach to runway 15. Since the airport is inside the busy Toronto terminal area, the availability of approaches depends heavily on traffic flow to other airports.

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The airport has a control tower using the frequencies 127.10 MHz for Automatic Terminal Information Service (ATIS), 121.80 MHz for ground control, and 124.80 MHz for tower (with a backup frequency of 119.9 MHz used during busy periods). When the tower is closed, 124.80 MHz becomes a mandatory frequency. The London, Flight Information Centre has a Remote Communications Outlet at the airport operating on the frequency 123.15 MHz. Toronto Terminal handles instrument flight rules (IFR) arrivals and departures on 133.40 MHz.

Flightline is available on 123.50 MHz.