Flyer or flier may mean:

• Flyer (pamphlet), a single page pamphlet

In aviation:

• Aviator, a person who flies aircraft for pleasure or as a profession
• Passenger, someone who travels on an aircraft
• FLYER (magazine), a monthly UK general aviation magazine
• Wright Flyer, the first powered aircraft designed and built by the Wright Brothers

In sport:

• Philadelphia Flyers, a National Hockey League team
• Fort Worth Flyers, an NBA Development League team
• Dayton Flyers, University of Dayton athletic team
• The top person in a cheerleading stunt

Vehicles:

• Flyer (steamboat), a steamboat that served from 1891 to 1930 on Puget Sound
• Flyer (automobile), manufactured by the Flyer Motor Car Company from 1913–1914
• USS Flier (SS-250), a Gato-class submarine launched in 1943
• BYD Flyer

In amusement rides:

• Flying roller coaster, a type of roller coaster where the riders are secured in flying position with the track overhead
• Flying Scooters, an amusement ride consisting of suspended vehicles rotating around a center post

In other contexts:

• Flier (fish) (Centrarchus macropterus), a North American fish
• Flyer (Nanci Griffith album), an album by Nanci Griffith from 1994
• Fast Low-Ionization Emission Region (FLIER), a poorly-understood structure in some planetary nebulae
• Flyer, a flying trapeze performer
• Flyer, a female kangaroo
• Flyer, a pterosaur in the The Land Before Time film series
• Flyer Industries Limited, a former name of New Flyer Industries
• Flyer (Croatian band)
• FlyEr, a Belarusian rap artist