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

18 June 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

^{th June 2008}

^{SHARE REPURCHASE
PROGRAMME}

^{CRH plc announces that on
17}

^{th June 2008, Davy purchased, on
behalf of the Company, 60,000 Ordinary Shares of €0.32
each in CRH plc at prices between €19.17 and
€19.80 per Ordinary Share. The purchased shares will
be held as Treasury Shares.

Following the above transactions, CRH plc holds 12,068,373
Ordinary Shares in Treasury. The number of Ordinary Shares
in issue (excluding Treasury Shares) is 536,052,063.}

^{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: 18 June 2008

By: ___/s/ M. Lee___

M. Lee
Finance Director