1934 Act Registration No. 1-14700

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER
PURSUANT TO RULE 13a-16 OR 15d-16 OF
THE SECURITIES EXCHANGE ACT OF 1934

For the month of July 2006

Taiwan Semiconductor Manufacturing Company Ltd.

(Translation of Registrant’s Name Into English)

No. 8, Li-Hsin Rd. 6,
Hsinchu Science Park,
Taiwan

(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 þ Form 40-F o

     (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 o No þ

     (If “Yes” is marked, indicated below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82: ___.)

TSMC June 2006 Sales Report

Hsinchu, Taiwan, R.O.C. — July 10, 2006 — TSMC (TAIEX: 2330, NYSE: TSM) today announced its net sales for June 2006: on an unconsolidated basis, sales were NT$27,295 million, an increase of 2.0 percent over May 2006 and an increase of 35.8 percent over June 2005; revenues for January through June 2006 totaled NT$158,521 million, an increase of 38.8 percent over the same period in 2005.

On a consolidated basis, net sales for June 2006 were NT$27,647 million, an increase of 1.9 percent over May 2006; revenues for January through June 2006 totaled NT$160,010 million.

TSMC Sales Report (Unconsolidated):

(Unit: NT$ million)

Net Sales	2006*		2005		Increase (Decrease) %
June		27,295		20,105		35.8
January through June		158,521		114,169		38.8

* Year 2006 figures have not been audited.

TSMC Spokesperson:

Ms. Lora Ho

Vice President and CFO
Tel: 886-3-566-4602

TSMC Acting Spokesperson:

Mr. J.H. Tzeng

PR Department Manager, TSMC
Tel: 886-3-666-5028
Mobile: 0928-882607
Fax: 886-3-567-0121
E-Mail: jhtzeng@tsmc.com

For further information, please contact:

Richard C.Y. Chung

Media Relations Manager, TSMC
Tel: 886-3-666-5038
Mobile: 886-911-258751
Fax: 886-3-567-0121
E-Mail: cychung@tsmc.com

Taiwan Semiconductor Manufacturing Company Limited
July 10, 2006

This is to report the changes or status of 1) sales volume, 2) funds lent to other parties, 3) endorsements and guarantees, and 4) financial derivative transactions for the period of June 2006.

1) Sales volume (in NT$ thousand)

Period	Items	2006		2005
June.	Net sales		27,294,797		20,105,150
Jan.-June.	Net sales		158,520,691		114,169,434

2) Funds lent to other parties (in NT$ thousand)

	Limit of lending		June.			Bal. as of period end
TSMC		95,586,606		—			—
TSMC’s subsidiaries		32,009,175		(1,120,665	)		—

3) Endorsements and guarantees (in NT$ thousand)

	Limit of endorsements		June.			Bal. as of period end
TSMC		119,483,257		22,800	*		1,943,940
TSMC’s subsidiaries		N/A		—			—
TSMC endorses for subsidiaries				22,800	*		1,943,940
TSMC’s subsidiaries endorse for TSMC				—			—
TSMC endorses for PRC companies				—			—
TSMC’s subsidiaries endorse for PRC companies				—			—

* The deviation was due to the fluctuation in currency exchange rate.

4) Financial derivative transactions (in NT$ thousand)

Hedging purpose (for assets / liabilities denominated in foreign currencies)

								Others
		Forward			Swap			Buy put		Sell call
Margin Payment			—			—			—		—
Premium Income (Expense)			—			—			—		—
Outstanding Contracts	Notional Amount		731,700			73,076,310			—		—
	Mark to Market Profit/Loss		(8,265	)		(269,187	)		—		—
Expired Contracts	Notional Amount		9,829,118			210,840,466			639,620		639,620
	Realized Profit/Loss		54,755			412,612			—		—

SIGNATURES

     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.

	Taiwan Semiconductor Manufacturing Company Ltd.
Date: July 10, 2006	By:	/s/ Lora Ho
		Lora Ho
		Vice President & Chief Financial Officer