EXHIBIT 99.906.CERT

This certification is provided pursuant to Section 906 of the Sarbanes-Oxley Act
of 2002, 18 U.S.C. Section 1350, and accompanies the report on Form N-CSR for
the period ended December 31, 2005 of The Endowment Master Fund, L.P. (the
"Registrant").

I, Andrew B. Linbeck, the Co-Principal Executive Officer of the Registrant,
certify that, to the best of my knowledge,:

1.   the Form N-CSR fully complies with the requirements of Section 13(a) or
     15(d) of the Securities Exchange Act of 1934 ( 15 U.S.C. 78m(a) or 78o(d));
     and

2.   the information contained in the Form N-CSR fairly presents, in all
     material respects, the financial condition and results of operations of the
     Registrant.

February 27, 2006
Date


/s/ Andrew B. Linbeck
- -------------------------------------
Andrew B. Linbeck
Co-Principal Executive Officer

This certification is being furnished solely pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002 and is not being filed as part of Form N-CSR or as a
separate disclosure document. A signed original of this written statement
required by Section 906 has been provided to the Registrant and will be retained
by the Registrant and furnished to the Securities and Exchange Commission or its
staff upon request.



This certification is provided pursuant to Section 906 of the Sarbanes-Oxley Act
of 2002, 18 U.S.C. Section 1350, and accompanies the report on Form N-CSR for
the period ended December 31, 2005 of The Endowment Master Fund, L.P. (the
"Registrant").

I, A. Haag Sherman, the Co-Principal Executive Officer of the Registrant,
certify that, to the best of my knowledge,:

1.   the Form N-CSR fully complies with the requirements of Section 13(a) or
     15(d) of the Securities Exchange Act of 1934 ( 15 U.S.C. 78m(a) or 78o(d));
     and

2.   the information contained in the Form N-CSR fairly presents, in all
     material respects, the financial condition and results of operations of the
     Registrant.

February 27, 2006
Date


/s/ A. Haag Sherman
- -------------------------------------
A. Haag Sherman
Co-Principal Executive Officer

This certification is being furnished solely pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002 and is not being filed as part of Form N-CSR or as a
separate disclosure document. A signed original of this written statement
required by Section 906 has been provided to the Registrant and will be retained
by the Registrant and furnished to the Securities and Exchange Commission or its
staff upon request.



This certification is provided pursuant to Section 906 of the Sarbanes-Oxley Act
of 2002, 18 U.S.C. Section 1350, and accompanies the report on Form N-CSR for
the period ended December 31, 2005 of The Endowment Master Fund, L.P. (the
"Registrant").

I, John A. Blaisdell, the Co-Principal Executive Officer of the Registrant,
certify that, to the best of my knowledge,:

1.   the Form N-CSR fully complies with the requirements of Section 13(a) or
     15(d) of the Securities Exchange Act of 1934 ( 15 U.S.C. 78m(a) or 78o(d));
     and

2.   the information contained in the Form N-CSR fairly presents, in all
     material respects, the financial condition and results of operations of the
     Registrant.

February 27, 2006
Date


/s/ John A. Blaisdell
- -------------------------------------
John A. Blaisdell
Co-Principal Executive Officer

This certification is being furnished solely pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002 and is not being filed as part of Form N-CSR or as a
separate disclosure document. A signed original of this written statement
required by Section 906 has been provided to the Registrant and will be retained
by the Registrant and furnished to the Securities and Exchange Commission or its
staff upon request.



This certification is provided pursuant to Section 906 of the Sarbanes-Oxley Act
of 2002, 18 U.S.C. Section 1350, and accompanies the report on Form N-CSR for
the period ended December 31, 2005 of The Endowment Master Fund, L.P. (the
"Registrant").

I, John E. Price, the Principal Financial Officer of the Registrant, certify
that, to the best of my knowledge,:

1.   the Form N-CSR fully complies with the requirements of Section 13(a) or
     15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m(a) or 78o(d));
     and

2.   the information contained in the Form N-CSR fairly presents, in all
     material respects, the financial condition and results of operations of the
     Registrant.

February 27, 2006
Date


/s/ John E. Price
- -------------------------------------
John E. Price
Principal Financial Officer

This certification is being furnished solely pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002 and is not being filed as part of Form N-CSR or as a
separate disclosure document. A signed original of this written statement
required by Section 906 has been provided to the Registrant and will be retained
by the Registrant and furnished to the Securities and Exchange Commission or its
staff upon request.