Usually the term "internal customer" refers to staff within the same organisation, so how about 同事???

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Note added at 12 mins (2004-11-30 19:12:42 GMT)
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The \"internal customer\" do not have to buy the company\'s products or services. In another word, they do not have to be a \"paying customer\".

Definition:
An internal customer or internal service provider can be anyone in the organization. An internal customer can be a co-worker, another department, or a distributor who depends upon us to provide products or services which in turn are utilized to create a deliverable for the external customer.
(In this case, 同事 is out!)

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Note added at 13 mins (2004-11-30 19:13:29 GMT)
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correction: The \"internal customer\" does not have to buy the company\'s products or services. In another word, he or she does not have to be a \"paying customer\".


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Note added at 13 mins (2004-11-30 19:14:19 GMT)
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You might like to read this article: http://www.hyken.com/Article_10.html

内部营销与人力资源管理关系论--飘在北京
... 经理们意识到这一问题的重要性和特殊性，开始寻求别开生面的管理方法。此时，
这谢网页都译为内部顾客。实际上是指把员工当作顾客对待，满足他们的需求。这是一种管理理念。

营销学发明了内部营销，把员工变成内部市场，把服务人员变成内部顾客（internal
customers），而管理学发明了市场导向的人力资源管理（Market ...
garyc.blogdriver.com/garyc/238695.html - 29k - 网页快照 - 类似网页

UTSTARCOM


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Note added at 4 hrs 9 mins (2004-11-30 23:09:30 GMT)
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把员工称为\"内部顾客\", 是一种新的经营管理理念和实践。与过去的人事管理不同，新的人力资源观念要求公司指把员工当作顾客对待，强化为他们服务， 满足他们的需求。 建议直译\"内部顾客\", 加引号。以后人们看多了这个词，就见怪不怪了，到那时引号也就会自然退出了。相信英语读者刚接触 INTERNAL COSTOMERS 时，也同样有怪诞的感觉，因为 这两个词搭配，听起来是矛盾的。