Superconducting transistors, especially those comprised of high-critical temperature (high-T_c) superconductors, are reviewed. There are three basic types of superconducting transistors, a quasiparticle injection device, a field effect and a superconductor base transistor. Characteristic and operating principles of these superconducting tcansistors are described. These transistors have mainly been fabricated using conventional metal superconductors. However, a few high-T_c superconducting transistors have been tried to fabricate to date. An operating temperature performances, characteristics, and peculiar properties concerning to device structure and fabrication methods expected for high-T_c superconducting transistors are also discussed in this report.