邀请函是邀请亲朋好友或知名人士、专家等参加某项活动时所发的请约性书信。它是现实生活中常用的一种日常应用写作文种。 邀请函的格式主要有四个部分，分别是标题、称谓、正文、落款。
一、标题
由活动名称和文种名组成，还可包括个性化的活动主题标语。如“XX公司年终客户答谢会邀请函”。活动主题标语可以体现举办方特有的企业文化特色。
二、称谓
邀请函的称谓使用“统称”，并在统称前加敬语。如 ，“尊敬的× × ×先生/女士”或“尊敬的× × ×总经理(局长)”。
三、正文
邀请函的正文是指商务礼仪活动主办方正式告知被邀请方举办活动的'缘由、目的、事项及要求，写明活动的日程安排、时间、地点，并对被邀请方发出得体、诚挚的邀请。正文结尾一般要写常用的邀请惯用语。如“敬请光临”、“欢迎光临”。
四、落款
落款要写明礼仪活动主办单位的全称和成文日期。
【邀请函格式模板注意问题】
一、被邀请者的姓名应写全，不应写绰号或别名。
二、在两个姓名之间应该写上"暨"或"和"，不用顿号或逗号。
三、应写明举办活动的具体日期(几月几日，星期几)。
四、写明举办活动的地点。
模板 1
__________单位(领导朋友等)：
感谢您一直以来对本公司(或本人)的关心和支持，使公司得以业务蓬勃发展，现公司已迁至————(某地)，诚邀请贵单位(或领导朋友)在(时间地点)参观公司新址，并赴本公司的庆典午宴。
落款：(单位、时间)
模板2
尊敬的___________：您好!
________单位将于__年__月__日在________地，举办___________活动，特邀您参加，谢谢。
_________单位
An Invitation
May 10，20xx
Dear Blake，
Mrs. White will soon leave for the United States and we will held a farewell party for her which takes place from 6:00 p.m. to 7:30 p.m. on Friday，May 20，20xx at the School Club. I am very pleased to invite you toparticipatein the farewell party. Another two foreign teachers you know，Mr. Frazer and Miss Gree are also invited. Please join us to say goodbye to Mrs. White. You are hoped to arrive at 5:50 p.m. I look forward to see you on May 20.
Yours sincerely，
Yan Yang
邀请信
20xx年5月10日
亲爱的布莱克：
怀特老师很快就去美国了，我们将为她举行一次欢送会，时光是星期五晚上六点到七点半，地点是学校俱乐部.我很高兴邀请你来参加欢送会.我们还邀请了你认识的另外两位外教Frazer和Gree.期望你能和我们一齐送别怀特老师.期望你5点50能到这.期盼那天能看到你.
晏阳
MR glue BB/CC，poplar core，Thickness tolerance +/-0.5mm，M/C is below bb%，flat surface
If you don’t try you will never know our quality level .you will increase your petitor‘s absolute advantage，they have our good quality and better prices，how can you pete with them
We really want to establish long-lasting business relationship with you，so we give you these best prices .you can pare with other suppliers now .you can ask your people to test the quality.
Don’t miss this great opportunity .if you want to try，please tell me ASAP，because the prices will be higher USDb to 1b after September bbb I think your current vendors are small factories，right so they have lower prices with lower quality .
I think they have not stable and fixed quality .if they have better orders they will not do your orders .I am looking forward to hearing from your reply.
bbb please make your decision ASAP. If you want to strengthen your petitive power，please don’t hesitate to ask me send the sales contract to you.
Dear Petty，
I hope you didn’t make any plane for this weekend. You know I am moving into the new house，and I sincerely invite you to e to my new house.
I will hold a celebration party on Saturday night. The scenery here is fantastic that I am sure you will like it. On Saturday，you can walk around my house after you get here. The party will begin at 7:00.
You can live in my house that night. On Sunday，we can go fishing or play table tennis. So please do some preparation for them. You can drive here and you will see a board “Kelly’s Home” near the road. It only takes you one hour to get here. I hope there will be nothing stopping you to e.
Yours affectionately，
Kelly
亲爱的贝蒂：
期望你这个周末没有什么安排!你明白我就要搬到新房了，我真诚的邀请你来我的新房.星期六晚上我会举行一个庆祝晚会.那里的景色漂亮迷人，我相信你必须会喜欢的.星期六到那里后你能够在我家到处看看.晚会将在7点开始，到时候你能够住在我家.你能够开车过来，然后你会看见路边的一块板上写着“凯丽家”.你到那里只需一个小时，我期望你不会有什么事情而不能来.
Dear [Zhang Ying]:
Will you e to luncheon on [Friday，May the fifth]，at [twelve o’clock]?
My niece [Mary] is visiting us and I think you will enjoy meeting her. She is a charming，very pretty girl ? and very good pany! [John and Jane] will be here，and perhaps we can [give a dance] after luncheon. Do say you’ll e!
Affectionately yours，
Li Ming
中国驻***大使馆：
福州大学因需要开展日本文学、日本语言文化研究等学术科研活动，拟于20xx年4月邀请日本***大学教育文化学部的退休教授*****（姓：****，名：****，性别：*，出生年月：****年*月**日，护照：******）来我校进行学术交流访问，时间自20xx年4月22日至20xx年6月30日，望使馆批准1次入境停留90天的访问签证，万分感谢！
*****先生的往返机票费及访问期间的食住行由我校负责。我校在此担保****先生会按时出入境。
福 州 大 学****学院
20xx年3月2日
Shenzhen Aidelong Electronic Technology Co., Ltd Address : 4/F,Bld B8 Xiufeng Industrial City,Buji,Longgang Dist.,Shenzhen,China
Tel: 86-755-6124 6288 Ext.8003 Fax: 86-XXXX
INVITATION LETTER
Mohammed Ahmed
Director Date : 1th November 20xx
Prime Computer
95/1, New Elephant Road
Zinnat Mansion (Ground floor)
Dhaka – 1205, Bangladesh
Phone : 880-XXXX
Mobile : 88XXXX
May 5，20xx
Dear Mike，
This Saturday is my birthday and my parents will hold a simple celebrating party for me. I am glad to invite you to e to the party. Blair，Emma and Roan will also be invited. I am sure we will have a good time. We will have dinner at 18:30 so that you are wished to e at 18:15. My mother is a good cook and you will enjoy the dishes. After the dinner，we will play some small games and then eat the cake. My parents and I sincerely expect you to e and hope to see you then.
True yours，
Daniel
亲爱的迈克：
这个星期六是我的生日，我父母将给我举行一个简单的庆祝派对.我很高兴邀请你来参加派对.我也邀请了布莱尔，艾玛和罗恩.我相信我们会度过一段完美时光的.我们将在6点半吃晚饭，所以期望你们6点15能到.我妈妈厨艺很好，你们必须会喜欢的.吃完晚饭，我们会玩一些小游戏，然后吃蛋糕.我父母和我都真诚期望你们来，期望到时能看到你们.
爱你的丹尼尔