Transaction in Own Shares

Rio Tinto PLC
23 May 2007


Rio Tinto plc today acquired through Credit Suisse Securities (Europe) Ltd
200,000 of its ordinary shares at an average price of 3,575.66 pence per
ordinary share.  The purchased shares will all be held as treasury shares.

Following the above purchase, Rio Tinto plc holds 70,080,463 ordinary shares as
treasury shares.  The total number of ordinary shares in issue (excluding shares
held as treasury shares) is 1,001,691,333.


For further information, please contact:

Investor Relations
Nigel Jones
Office: [phone]
Mobile: [phone]

Secretarial Department
Matthew Whyte
Office: [phone]

Website: www.riotinto.com


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