Transaction in Own Shares

Rio Tinto PLC
23 April 2007




Rio Tinto plc today acquired through Credit Suisse Securities (Europe) Ltd
450,000 of its ordinary shares at an average price of 3,107.51 pence per
ordinary share.  The purchased shares will all be held as treasury shares.



Following the above purchase, Rio Tinto plc holds 66,546,879 ordinary shares as
treasury shares.  The total number of ordinary shares in issue (excluding shares
held as treasury shares) is 1,005,208,265.





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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