Rocky Mountain Science Collections Center Act of 2007 - Authorizes the Secretary of the Interior to provide a grant to the Denver Museum of Nature & Science in Denver, Colorado, to pay the federal share of the cost of: (1) constructing one or more on-site collection facilities that meet the standards of the Museum; and (2) obtaining goods and services required by the Museum, including the acquisition of designs, plans, furnishings, equipment, and other support for the Museum.

Requires the Museum, as a condition of receiving such assistance, to match any amounts provided to the Museum under this Act. States that, in order to meet such matching requirement, the Museum may provide to the Secretary cash, in-kind donations, and services.