FORM 6-K

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549


                    Pursuant to Rule 13a - 16 or 15d - 16 of
                      the Securities Exchange Act of 1934

                           Report of Foreign Issuer


                                 23 April 2008


                               File no. 0-17630


                           Transaction in Own Shares



                           CRH public limited company
                          Belgard Castle, Clondalkin,
                              Dublin 22, Ireland.
                    (Address of principal executive offices)


(Indicate by check mark whether the registrant files or will file annual reports
under cover of Form 20-F or Form 40-F).

                          Form 20-F X     Form 40-F



(Indicate by check mark whether the  registrant  by furnishing  the  information
contained  in this  Form is  also  thereby  furnishing  the  information  to the
Commission  pursuant to Rule  12g3-2(b)  under the  Securities  Exchange  Act of
1934).



                                 Yes      No X



(If "Yes" is marked,  indicate below the file number  assigned to the registrant
in connection with Rule 12g3-2(b): 82-________).




Enclosure: Transaction in Own Shares



23rd April 2008


SHARE REPURCHASE PROGRAMME


CRH plc announces that on 22nd April 2008, Davy purchased, on behalf of the
Company, 150,000 Ordinary Shares of EUR0.32 each in CRH plc at prices between
EUR23.309 and EUR23.70 per Ordinary Share.  The purchased shares will be held as
Treasury Shares.

Following the above transaction, CRH plc holds 9,896,450 Ordinary Shares in
Treasury. The number of Ordinary Shares in issue (excluding Treasury Shares) is
537,330,744.



Contact
Angela Malone
Company Secretary
Tel: 00 3531 6344340

___


                                  SIGNATURE


Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned, thereunto duly authorized.

                                                  CRH public limited company
                                                         (Registrant)





Date:  23 April 2008



                                                    By: ___/s/ M. Lee___

                                                        M. Lee
                                                        Finance Director