社交、親友這間的相互介紹，常用介紹信聯(lián)系。收信人從介紹信中可以了解到來(lái)者是什么人，要辦什么事，有什么具體要求等。
寫(xiě)這類(lèi)書(shū)要注意慎重、謙恭。在信封左下角常寫(xiě)有To introduce ……或Introducing……,信封一般不封。

1. 介紹中學(xué)同學(xué) Introducing a middle school classmate

Dear [Mr. Chang].

The bearer, [Ms Huan], is a classmate of mine at middle school, who has recently been assigned to work in your city. [She] is well educated, having good habits and agreeable manners. Any assistance you may give [her] concerning [her] life will be esteemed as a great favor for me.

Yours truly,

親愛(ài)的[常先生]：

持信人[黃女士]是我的一位中學(xué)同學(xué)，最近[她]被派往你市工作。[她]受過(guò)良好的教育，沒(méi)有不良的習(xí)慣，舉止端莊。您對(duì)[她]生活上的任何幫助，將使我感同身受。

2. 介紹本人 Self-introduction

Dear [Sirs],

From your advertisement in [yesterday’s USA Today] I find that you are wanting a [Chinese teacher] in your college. I beg leave to take the liberty of offering myself for the position.

Born in [Beijing] in [1970], I am a graduate of [Beijing University], and therefore have a good knowledge both in Chinese and English.

Should my application be regarded favorably, I shall endeavor to justify the confidence you may repose in me.

Faithfully yours,

親愛(ài)的[先生們]：

[昨天《今日美國(guó)報(bào)》]載你院需[漢語(yǔ)教員]。我申請(qǐng)任此職務(wù)。

我[1970年]出生于[北京]，畢業(yè)于[北京大學(xué)]，漢語(yǔ)和英語(yǔ)均有所長(zhǎng)。

如蒙錄用，自當(dāng)竭誠(chéng)服務(wù)，以答雅意。

此致

敬禮！

3. 去具體單位的介紹信 Letter of introduction with a known unit

China travel Service

[April 15, 1993]

Bureau of Travel and Tourism

Administration

Gentleman in Charge,

The bearer of this lette