Improving Assistance to Domestic and Sexual Violence Victims Act of 2009

Improving Assistance to Domestic and Sexual Violence Victims Act of 2009 - Amends the Violence Against Women Act of 1994 to: (1) amend certain definitions, grant conditions relating to confidential information, and matching fund requirements under such Act; (2) expand the role of the national resource center on workplace responses to domestic violence to require information and assistance to victim service providers and other community-based organizations and coalitions; and (3) expand requirements for providing culturally and linguistically specific services to domestic and sexual violence victims.

Amends grant provisions under the violence against women program of the Omnibus Crime Control and Safe Streets Act of 1968 to: (1) impose limits on Internet publication of protection order information in domestic violence cases; (2) exempt victims of dating violence from certain costs for criminal proceedings and protection orders; (3) provide for sexual assault forensic medical personnel examiners to collect and preserve evidence in sexual assault cases; and (4) expand grant purposes to include HIV, hepatitis, and sexually transmitted infection testing and treatment for victims of sexual assault.

Amends the Immigration and Nationality Act and the William Wilberforce Trafficking Victims Protection Reauthorization Act of 2008 to expand visa eligibility for aliens who are victims of domestic violence and sex trafficking.

Amends the Housing and Community Development Act of 1980 to permit certain aliens lawfully present in the United States to qualify for low-income housing assistance.