Russell Zimmer Republican Diemer True Republican The 1990 Wyoming Senate election was held on November 6, 1990, to elect 15 members of the Wyoming Senate.

This was the last election held before Gorin v. Karpan struck down Wyoming's county-based legislative apportionment plan in favor of single-member districts in 1992.

[1]

For the sake of brevity, races in which no candidates filed are excluded.

To ease sorting, races won by a Republican candidate have a positive margin, while races won by Democratic candidates have negative margins.