地面中继式无线电（英文：TErrestrial Trunked RAdio，缩写：TETRA；前称跨欧陆中继式无线电；英文Trans European Trunked RAdio）是一种专门的专业无线电双向发报机（一般称为无线对讲机），专门为到政府机构、紧急服务（警察队、武装部队、消防局、救护车）、铁路运输、运输服务及军队的使用而设计的通信系统。

地面中继式无线电是欧洲电信标准协会自1995年以来设立的标准。地面中继式无线电在欧洲无线电通信委员会（ERC）的管理下应用在欧洲地区。

A tetra is one of several species of small freshwater fish from Africa, Central America and South America belonging to the biological family Characidae and to its former subfamilies Alestidae (the "African tetras") and Lebiasinidae. The Characidae are distinguished from other fish by the presence of a small adipose fin between the dorsal and caudal fins. Many of these, such as the neon tetra (Paracheirodon innesi), are brightly colored and easy to keep in captivity. Consequently, they are extremely popular for home aquaria.