Cecilia "Cessie" Alfonso (born January 14, 1945) is an American forensic social work, domestic violence prevention and response, and organizational development consultant and activist who has protested against the Vietnam War and the use of the death penalty in the United States to prosecute criminals and in support of improved civil rights for women and the LGBT community.

[23][24] Beginning in 1984, Alfonso provided expert witness testimony about domestic violence-related topics in legal cases in Florida, Maryland, New Jersey, New York, and Pennsylvania.

She also worked as a consultant and mitigation specialist on state and federal death penalty cases in Arizona, Florida, Georgia, Kentucky, Maryland, New Jersey, New York, Pennsylvania, Puerto Rico, and South Carolina.

[25][26][27][28][29][30] From 1994 to 2012, Alfonso was employed by county and state public defenders' offices in Florida, Illinois, Indiana, Kentucky, Missouri, New Jersey, New York, and Wisconsin to provide training to their attorneys and other personnel regarding client-centered representation, trial preparation and presentation, mitigation and sentencing issues, and domestic violence-related topics.

[32] She was also employed as a faculty member with the Clarence Darrow Death Penalty Defense College at DePaul University from 2005 to 2012, where she presented similar training programs and also addressed the impacts of poverty, race, gender, and class on attorneys' relationships with clients and in courtroom settings.