失物招领处怎么说？lost and found room？

就是lost and found就可以了。

失物招领处(用作招牌,一般不用the)
the Lost and Found
失物招领处(用作招牌,一般不用the)
the L - and Found
你也许可以在失物招领处找到你的手袋。
You may finds your handbag at the Lost and Found.
他们决定把它送到本城的失物招领处去。
They decided to send it to the city's lost - property office.

失物:
1. lost property
2. stealage
招领:
announce the finding of lost property

Lost Property
or: Lost property Dept.