The 1998 Esiliiga is the eighth season of the Esiliiga, second-highest Estonian league for association football clubs, since its establishment in 1992.
JK Eesti Põlevkivi Jõhvi beat KSK Vigri Tallinn 2–0 on aggregate. Eesti Põlevkivi remained in Meistriliiga, Vigri in Esiliiga.
FC Kuressaare beat FC M.C. Tallinn 2–1 on aggregate. Kuressaare remained in Esiliiga, M.C. in Second Division.