R9

R9 or R-9 may refer to:

Military

 * R-9 Desna, a Soviet ICBM
 * USS R-9 (SS-86), a United States Navy submarine in commission from 1919 to 1931 and from 1941 to 1945

Transportation

 * Camai Air, IATA airline code
 * R9 (New York City Subway car)
 * Radial Road 9 or R-9, an arterial road of Manila, Philippines
 * Renault R9, a small French family car
 * R9 (RER Vaud), an S-Bahn line in the canton of Vaud

Other uses

 * HP roman9, an 8-bit character set with euro sign
 * R9 color rendering index value for saturated red
 * R9: Explosive when mixed with combustible material, a risk phrase in chemistry
 * R9-Arms submachine gun, a black market submachine gun
 * R9, a x86-64 register number 9
 * R-9, a fictitious starfighter from the game R-Type
 * "R-9", a 1985 song by electronic band Cybrotron
 * Radeon R9, graphics processing units
 * Rohrbaugh R9, a compact pistol
 * Ronaldo (Brazilian footballer) (born 1976), retired Brazilian footballer
 * 'R9', the fan-nickname for the upcoming ninth studio album by Barbadian recording artist Rihanna.
 * A notation of "R9" next to an account on a credit report is not actually a credit score but rather a code that indicates the payment status of that account. Payment status affects your credit score, however, and an R9 status code is bad. It means the creditor considers your debt uncollectible.