The 2018 Kentucky House of Representatives elections were held on November 6, 2018, as part of the biennial United States elections. All 100 of Kentucky's state representatives were up for reelection. In Kentucky, members of the House of Representatives serve two-year terms. Accordingly, they are up for reelection in both presidential and midterm election years.

Democrats, who had long been the dominant party at the state level in Kentucky, held a majority in the state house from 1922 to 2017. In 2016, Republicans made large gains in the chamber, winning a majority of 64 seats. Both parties flipped several seats in 2018, with Republicans grabbing six seats from the Democrats and Democrats taking eight from the Republicans, for a net gain of two Democratic seats. Many of the Democratic gains were in suburban areas, including around Louisville, Lexington, and Owensboro. Republicans made gains in some of Democrats' remaining rural districts, though they significantly underperformed in Appalachian Eastern Kentucky, where Democrats picked up multiple seats.

Several races were decided by extremely narrow margins. Four seats—Districts 13, 27, 91, and 96—were all decided by seven votes or fewer. Republicans ultimately maintained their majority in the chamber, winning 61 seats to the Democrats' 39.

Seats where the margin of victory was under 10%:

Linda H. Belcher was elected on February 20, 2018, to fill the vacancy caused by the death of Dan Johnson in December 2017.

Robert Goforth was elected on February 27, 2018, to fill the vacancy caused by the resignation of Marie Rader in December 2017.

All results are official and certified by the Kentucky State Board of Elections.