A4 most often refers to.
Air Kiribati Limited is the national airline of Kiribati operating passenger services within the Gilbert Islands of Kiribati, and to Fiji.
Ararat International Airlines was an airline headquartered in Yerevan, Armenia and based at the city's Zvartnots International Airport.
Calabarzon, formally known as Southern Tagalog Mainland and designated as Region IV-A, is an administrative region in the Philippines.
Iva or IVA may refer to.
The Long March 4A, also known as the Changzheng 4A, CZ-4A and LM-4A, sometimes misidentified as the Long March 4 due to the lack of any such designated rocket, was a Chinese orbital carrier rocket.
Stalag IV-A Elsterhorst was a World War II German Army prisoner-of-war camp located south of the village of Elsterhorst (now Nardt), near Hoyerswerda in Saxony, north-east of Dresden (this should not however be confused with Stalag IV-A Hohnstein, which was located 20 miles ENE of Dresden).
The Texas Instruments TI-99/4A is a home computer, released June 1981 in the United States at a price of $525 ($ adjusted for inflation).
The A Series engines are a family of inline-four internal combustion engines with displacement from 1.3 L to 1.8 L produced by Toyota Motor Corporation.
Vermont Route 4A is an east–west state highway in Rutland County, Vermont, United States.
The 4A Engine is a graphics middleware engine developed by 4A Games for use in their video game Metro 2033, published by THQ.
4A Games Limited is a Ukrainian video game developer based in Sliema, Malta.
4A/OP or, Automatized Atmospheric Absorption Atlas, is an operational fast and accurate radiative transfer model for the infrared.