The 1994 Torrens state by-election was a by-election held on 7 May 1994 for the South Australian House of Assembly seat of Torrens, centred in the inner north-eastern suburbs of Adelaide. This was triggered by the death of Liberal MHA Joe Tiernan on 31 March 1994, only four months after winning the seat at its first contest in the 1993 state election on a two-party vote of 56.22 percent.