EXHIBIT 99.302CERT


I, William M. Lyons, certify that:


1.        I have  reviewed  this report on Form N-CSR of American  Century Asset
          Allocation Portfolios, Inc.;

2.        Based on my  knowledge,  this  report  does  not  contain  any  untrue
          statement  of a  material  fact  or  omit to  state  a  material  fact
          necessary to make the statements  made, in light of the  circumstances
          under which such  statements were made, not misleading with respect to
          the period covered by this report;

3.        Based on my knowledge,  the financial statements,  and other financial
          information  included in this report,  fairly  present in all material
          respects the financial  condition,  results of operations,  changes in
          net assets,  and cash flows (if the financial  statements are required
          to include a  statement  of cash flows) of the  registrant  as of, and
          for, the periods presented in this report;

4.        The registrant's  other  certifying  officer and I are responsible for
          establishing  and maintaining  disclosure  controls and procedures (as
          defined in Rule 30a-3(c) under the Investment Company Act of 1940) and
          internal control over financial reporting (as defined in Rule 30a-3(d)
          under the Investment Company Act of 1940) for the registrant and have:

          (a)       Designed such disclosure controls and procedures,  or caused
                    such disclosure controls and procedures to be designed under
                    our  supervision,   to  ensure  that  material   information
                    relating  to  the  registrant,  including  its  consolidated
                    subsidiaries,  is made  known to us by others  within  those
                    entities,  particularly  during  the  period  in which  this
                    report is being prepared;

          (b)       Designed such internal control over financial reporting,  or
                    caused such internal control over financial  reporting to be
                    designed  under  our  supervision,   to  provide  reasonable
                    assurance  regarding the reliability of financial  reporting
                    and the  preparation  of financial  statements  for external
                    purposes in accordance  with generally  accepted  accounting
                    principles;

          (c)       Evaluated the  effectiveness of the registrant's  disclosure
                    controls  and  procedures  and  presented in this report our
                    conclusions   about  the  effectiveness  of  the  disclosure
                    controls and  procedures,  as of a date within 90 days prior
                    to the filing date of this report based on such  evaluation;
                    and

          (d)       Disclosed  in this  report  any  change in the  registrant's
                    internal  control over  financial  reporting  that  occurred
                    during the second  fiscal  quarter of the period  covered by
                    this report that has materially  affected,  or is reasonably
                    likely  to  materially  affect,  the  registrant's  internal
                    control over financial reporting; and

5.        The registrant's  other certifying officer and I have disclosed to the
          registrant's  auditors  and the audit  committee  of the  registrant's
          board of directors (or persons performing the equivalent functions):

          (a)       All significant  deficiencies and material weaknesses in the
                    design or  operation  of  internal  control  over  financial
                    reporting  which are reasonably  likely to adversely  affect
                    the registrant's ability to record, process,  summarize, and
                    report financial information; and

          (b)       Any fraud, whether or not material, that involves management
                    or  other  employees  who  have a  significant  role  in the
                    registrant's internal control over financial reporting.


Date:  March 31, 2006



By:    /s/ William M. Lyons
       -------------------------------------------
       William M. Lyons
       President
       (principal executive officer)






I, Maryanne L. Roepke, certify that:

1.        I have  reviewed  this report on Form N-CSR of American  Century Asset
          Allocation Portfolios, Inc.

2.        Based on my  knowledge,  this  report  does  not  contain  any  untrue
          statement  of a  material  fact  or  omit to  state  a  material  fact
          necessary to make the statements  made, in light of the  circumstances
          under which such  statements were made, not misleading with respect to
          the period covered by this report;

3.        Based on my knowledge,  the financial statements,  and other financial
          information  included in this report,  fairly  present in all material
          respects the financial  condition,  results of operations,  changes in
          net assets,  and cash flows (if the financial  statements are required
          to include a  statement  of cash flows) of the  registrant  as of, and
          for, the periods presented in this report;

4.        The registrant's  other  certifying  officer and I are responsible for
          establishing  and maintaining  disclosure  controls and procedures (as
          defined in Rule 30a-3(c) under the Investment Company Act of 1940) and
          internal control over financial reporting (as defined in Rule 30a-3(d)
          under the Investment Company Act of 1940) for the registrant and have:

          (a)       Designed such disclosure controls and procedures,  or caused
                    such disclosure controls and procedures to be designed under
                    our  supervision,   to  ensure  that  material   information
                    relating  to  the  registrant,  including  its  consolidated
                    subsidiaries,  is made  known to us by others  within  those
                    entities,  particularly  during  the  period  in which  this
                    report is being prepared;

          (b)       Designed such internal control over financial reporting,  or
                    caused such internal control over financial  reporting to be
                    designed  under  our  supervision,   to  provide  reasonable
                    assurance  regarding the reliability of financial  reporting
                    and the  preparation  of financial  statements  for external
                    purposes in accordance  with generally  accepted  accounting
                    principles;

          (c)       Evaluated the  effectiveness of the registrant's  disclosure
                    controls  and  procedures  and  presented in this report our
                    conclusions   about  the  effectiveness  of  the  disclosure
                    controls and  procedures,  as of a date within 90 days prior
                    to the filing date of this report based on such  evaluation;
                    and

          (d)       Disclosed  in this  report  any  change in the  registrant's
                    internal  control over  financial  reporting  that  occurred
                    during the second  fiscal  quarter of the period  covered by
                    this report that has materially  affected,  or is reasonably
                    likely  to  materially  affect,  the  registrant's  internal
                    control over financial reporting; and

5.        The registrant's  other certifying officer and I have disclosed to the
          registrant's  auditors  and the audit  committee  of the  registrant's
          board of directors (or persons performing the equivalent functions):

          (a)       All significant  deficiencies and material weaknesses in the
                    design or  operation  of  internal  control  over  financial
                    reporting  which are reasonably  likely to adversely  affect
                    the registrant's ability to record, process,  summarize, and
                    report financial information; and

          (b)       Any fraud, whether or not material, that involves management
                    or  other  employees  who  have a  significant  role  in the
                    registrant's internal control over financial reporting.


Date:  March 31, 2006



By:    /s/ Maryanne L. Roepke
       ---------------------------------------
       Maryanne L. Roepke
       Sr. Vice President, Treasurer, and
       Chief Financial Officer
       (principal financial officer)