1998 Wyoming Senate election

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The 1998 Wyoming Senate election was held on November 3, 1998, as part of the 1998 United States elections. Party primaries took place on August 18. All odd-numbered seats in the Wyoming Senate were up for election.

Overview:
- Before the election: Republicans held 21 seats, Democrats 9.
- After the election: Republicans held 20 seats, Democrats 10.
- Net change: Democrats gained 1 seat overall (Republicans flipped 1 Democratic seat; Democrats flipped 2 Republican seats).

Key district results:
- SD 9: Democrat Mike Massie defeated incumbent Republican Vincent Picard. Democrat gain.
- SD 11: Democrat Bill Vasey defeated incumbent Republican Bob Grieve. Democrat gain.
- SD 25: Republican Cale Case defeated Democrat John Vinich (incumbent). Republican gain.

In most districts, the general election was not highly competitive; only six of the fifteen districts were contested, and only two races were decided by a margin under 15 points.

Leadership changes:
- Before the election, Senate President was Bob Grieve (Republican).
- After the election, Jim Twiford (Republican) was elected Senate President.

Other contextual notes:
- The election occurred alongside Wyoming’s House of Representatives elections, the statewide governor’s race, and other statewide offices.