2018 Maryland House of Delegates election

The 2018 Maryland House of Delegates elections were held on November 6, 2018, as part of the biennial United States elections. All 141 of Maryland's state delegates were up for reelection.

Prior to the election, there was little doubt that Democrats would hold their majority in the chamber. Maryland's House of Delegates has had a Democratic majority since the elections of 1920, and it remains a solidly Democratic in elections at both the national and state level. Still, there was some discussion about whether or not Republicans would be able to make inroads in the chamber, especially considering that popular incumbent governor Larry Hogan was running for reelection at the top of the ticket simultaneously. These hopes were not met; though Hogan won his race by double digits, there was very little down-ballot appetite for Republicans, including in the House of Delegates.

Democrats picked off eight seats from Republicans, while Republicans flipped one seat from Democrats. The result was a net gain of seven seats for the Democrats, which came from across the state. Six counties had seats flip to the Democrats, including two in Baltimore County. The one seat Republicans did pick up was in a conservative Anne Arundel County district where a retiring incumbent had switched parties from Republican to Democratic the month before the election.

Overall, the results were a seen as a disappointment for Republicans, who had hoped Hogan's success would carry more Republicans to Annapolis. After the elections, Democrats held 99 seats to the Republicans' 42, meaning Democrats were in possession of more than 70% of seats in the chamber—maintaining their three-fifths supermajority capable of overriding gubernatorial vetoes. Many factors contributed to the Democrats' gains, but President Donald Trump's unpopularity in Maryland, as well as the state's large and growing minority population and its heavily suburban nature, were among the most important.

Democrats

 * 1) District 11: Dan K. Morhaim retired.
 * 2) District 12: Clarence Lam retired to run for state senator in District 11.
 * 3) District 13: Frank S. Turner retired.
 * 4) District 15: Aruna Miller retired to run for Congress in Maryland's 6th congressional district.
 * 5) District 16: William Frick retired to run for Montgomery County Executive.
 * 6) District 17: Andrew Platt retired.
 * 7) District 18: Ana Sol Gutierrez retired to run for the Montgomery County Council in District 1.
 * 8) District 18: Jeff Waldstreicher retired to run for state senator in District 18.
 * 9) District 19: Benjamin F. Kramer retired to run for state senator in District 19.
 * 10) District 20: Sheila E. Hixson retired.
 * 11) District 21: Barbara A. Frush retired.
 * 12) District 24: Carolyn J. B. Howard retired.
 * 13) District 25: Angela Angel retired to run for state senator in District 25.
 * 14) District 26: Tony Knotts retired to run for the Prince George's County Council in District 8.
 * 15) District 28: Sally Y. Jameson retired.
 * 16) District 31B: Meagan Simonaire retired.
 * 17) District 32: Alice Sophocleus retired.
 * 18) District 32: Pamela Beidle retired to run for state senator in District 32.
 * 19) District 39: Charles E. Barkley retired to run for an at-large seat on the Montgomery County Council.
 * 20) District 40: Antonio Hayes retired to run for state senator in District 40.
 * 21) District 43: Mary L. Washington retired to run for state senator in District 43.
 * 22) District 45: Cory McCray retired to run for state senator in District 45.

Republicans

 * 1) District 4: Kathy Afzali retired to run for Frederick County Executive.
 * 2) District 4: David E. Vogt III retired.
 * 3) District 7: Pat McDonough retired to run for Baltimore County Executive.
 * 4) District 8: Christian Miele retired to run for state senator in District 8.
 * 5) District 30: Herbert H. McMillan retired.
 * 6) District 38C: Mary Beth Carozza retired to run for state senator in District 38.
 * 7) District 42B: Chris West retired to run for state senator in District 42.
 * 8) District 42B: Susan L. M. Aumann retired.

Democrats

 * 1) District 19: Maricé Morales lost renomination to Charlotte Crutchfield, Vaughn Stewart, and incumbent Bonnie Cullison.
 * 2) District 23B: Joseph F. Vallario Jr. lost renomination to Ron Watson and incumbent Marvin E. Holmes Jr..
 * 3) District 39: Shane Robinson lost renomination to Gabriel Acevero, Lesley Lopez, and incumbent Kirill Reznik.
 * 4) District 40: Bilal Ali and Angela Gibson lost renomination to Dalya Attar, Tony Bridges, and incumbent Samuel I. Rosenberg.
 * 5) District 47A: Jimmy Tarlau lost renomination to Julian Ivey and incumbent Diana M. Fennell.
 * 6) District 47B: Carlo Sanchez lost renomination to Wanika B. Fisher.

Republicans

 * 1) District 3B: William Folden lost to Kenneth P. Kerr.
 * 2) District 8: Joe Cluster lost to Harry Bhandari, Joseph C. Boteler III, and incumbent Eric M. Bromwell.
 * 3) District 9B: Robert Flanagan lost to Courtney Watson.
 * 4) District 29B: Deb Rey lost to Brian M. Crosby.
 * 5) District 33: Tony McConkey lost to Heather Bagnall and incumbents Michael E. Malone and Sid Saab.
 * 6) District 34A: Glen Glass lost to Steven C. Johnson and incumbent Mary Ann Lisanti.

List of districts
All election results are from the Maryland Board of Elections.