感謝信是向幫助、關心和支持過自己的集體(黨政機關、企事業單位、社會團體等)或個人表示感謝的專業書信，有感謝和表揚雙重意思。寫感謝信既要表達出真切的謝意，又要起到表揚先進、弘揚正氣的作用。它廣泛應用于個人與個人之間個人與組織之間，組織與組織之間，用于向給予自己幫助、關心和支持的對方表示感謝。

　　英文感謝信(1)

　　Dear John,

　　I am writing to thank you for looking after me after that unfortunate accident the other day, when I was knocked off my bike by a taxi. If it had not been for your assistance in giving me first aid and taking me to a nearby hospital, I fear that the consequences might have been much more serious

　　英文感謝信(2)

　　Dear Mr. Nichole,

　　I am writing this letter to you to thank you for telling me such exciting news. It is really a great honor me to be admitted to your college. I will never forget your great kindness and help in the process of my application. My gratitude is beyond words. Thanks again!

　　Sincerely yours, Brown

　　英文感謝信(3)

　　Dear Sir,

　　I am writing to express my thanks for your kind staff whose work number card is 2938.

　　I came across him/her just when I was on the plane which was ready to take off.

　　I meant to switch/turn off my mobile phone as the flight attendant asked when I happened to find it missing.

　　It was not long before he/she helped me find it that was lying on the floor, slipping from my pocket.

　　Thanks again for his/her kindness, making me enjoy a fairly smooth trip despite such an incident.

　　Yours, John/Mary