Stephen W. Lafferty (born February 28, 1949) is an American politician who represents district 42 in the Maryland House of Delegates. Lafferty is the first Democrat to be elected in district 42 since it was moved to Baltimore County after the 21st century census and redistricting.
Delegate Lafferty was born in Washington, D.C. on February 28, 1949. He attended the University of Maryland, College Park where he earned his B.A. in American studies in 1971. Just a year later at Bowling Green State University, he earned a M.A. also in American studies; and then a teacher's certificate at Towson State University in 1977. Teacher (mathematics & social studies), Baltimore City Public Schools, 1974-78. Executive director & assistant director, Baltimore American Indian Center, Inc., 1978-80. University of Baltimore School of Law, J.D., 1983. Admitted to Maryland Bar, 1983.
Married to Betsy Lafferty. Resides in Stoneleigh.
In the legislature
Lafferty has been a member of House of Delegates since January 10, 2007. He serves on the House Environmental Matters Committee and its housing & real property, its land use & ethics and its local government & bi-county subcommittees. He also contributed to the ground rent legislation of 2007 through the ground rent work group. 
- voted for the Clean Indoor Air Act of 2007 (HB359)
- voted in favor of prohibiting ground rents in 2007(SB106)
- voted for the Maryland Gang Prosecution Act of 2007 (HB713), subjecting gang members to up to 20 years in prison and/or a fine of up to $100,000 
- voted for Jessica’s Law (HB 930), eliminating parole for the most violent child sexual predators and creating a mandatory minimum sentence of 25 years in state prison, 2007 
- voted for Public Safety – Statewide DNA Database System – Crimes of Violence and Burglary – Post conviction (HB 370), helping to give police officers and prosecutors greater resources to solve crimes and eliminating a backlog of 24,000 unanalyzed DNA samples, leading to 192 arrests, 2008 
- voted for Vehicle Laws – Repeated Drunk and Drugged Driving Offenses – Suspension of License (HB 293), strengthening Maryland’s drunk driving laws by imposing a mandatory one year license suspension for a person convicted of drunk driving more than once in five years, 2009 
- voted for HB 102, creating the House Emergency Medical Services System Workgroup, leading to Maryland’s budgeting of $52 million to fund three new Medevac helicopters to replace the State’s aging fleet, 2009 
- co-sponsored and voted for HB0294 (cross filed with SB281) that restricted gun possession, 2012 
- 2006 Race for Maryland House of Delegates – District 42
- Voters to choose three:
Name Votes Percent Outcome Susan Aumann, Rep. 22,054 18.3% Won Stephen W. Lafferty, Dem. 21,117 17.5% Won William J. Frank, Rep. 20,522 17.0% Won Dilip Paliath, Rep. 19,490 16.2% Lost Tracy Miller, Dem. 19,168 15.9% Lost Andrew Belt, Dem. 18,006 14.9% Lost Other Write-Ins 88 0.1% Lost
- 2002 Race for Maryland House of Delegates – District 42
- Voters to choose three:
Name Votes Percent Outcome Susan Aumann, Rep. 21,326 17.2% Won William J. Frank, Rep. 20,881 16.9% Won John G. Trueschler, Rep. 21,591 17.4% Won Stephen W. Lafferty, Dem. 18,958 15.3% Lost James W. Campbell, Dem. 18,168 14.7% Lost Matthew Joseph, Dem. 17,478 14.1% Lost Rick Kunkel, Green 5,464 4.4% Lost Other Write-Ins 66 0.1% Lost