Liquid-crystalline medium characterized in that it comprises one or more compounds of formula T in which R S1 and R S2, independently of one another, denote alkyl, alkoxy, preferably having 1 o 7 C atoms, wherein one -CH 2 -group may be replaced by cyclo-propylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclo-pentenylene, preferably by cyclopropylene or 1,3-cyclopentylene, alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms and preferably alkyl or alkenyl, wherein one -CH 2 - group may be replaced by cyclo-propylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclo-pentenylene, preferably by cyclopropylene or 1,3-cyclopentylene, alternatively R S1 denotes fluorinated alkyl or fluorinated alkoxy, preferably having 1 o 7 C atoms, or fluorinated alkenyl having 2 to 7 C atoms, alternatively, R S2 denotes X S X S denotes F, Cl, CN, NCS, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy or fluorinated alkenyloxy, the latter four groups preferably having 1 to 4, preferably 1 or 2, C atoms, preferably F, Cl, CF 3 or OCF 3, more preferably F, CF 3 or OCF 3, most preferably CF 3 or OCF 3, and Y S1 and Y S2, independently of one another, denote H or F, preferably one of them, most preferably both of them denote F, and wherein one or more, preferably one, of the aromatic rings may optionally be substituted by an alkyl group, preferably by methyl, and one or more compounds of formula L in which R L1 and R L2, independently of one another, denote alkyl, alkoxy, preferably having 1 o 7 C atoms, wherein one -CH 2 -group may be replaced by cyclo-propylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclo-pentenylene, preferably by cyclopropylene or 1,3-cyclopentylene, alkenyl or alkenyloxy, alkoxyalkyl and preferably alkyl or alkenyl, wherein one -CH 2 -group may be replaced by cyclo-propylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclo-pentenylene, preferably by cyclopropylene or 1,3-cyclopentylene, alternatively R L1 denotes fluorinated alkyl or fluorinated alkoxy, preferably having 1 o 7 C atoms, or fluorinated alkenyl having 2 to 7 C atoms, alternatively, R L2 denotes X L X L denotes F, Cl, CN, NCS, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy or fluorinated alkenyloxy, the latter four groups preferably having 1 to 4, preferably 1 or 2, C atoms, preferably F, Cl, CF 3 or OCF 3, more preferably F, CF 3 or OCF 3, more preferably CF 3 or OCF 3, most preferably CF 3, and Y L1 and Y L2, independently of one another, denote H or F, preferably one of them, most preferably both of them denote H, and wherein the aromatic ring may optionally be substituted by an alkyl group, preferably by methyl. R S1 and R S2, independently of one another, denote alkyl, alkoxy, preferably having 1 o 7 C atoms, wherein one -CH 2 -group may be replaced by cyclo-propylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclo-pentenylene, preferably by cyclopropylene or 1,3-cyclopentylene, alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms and preferably alkyl or alkenyl, wherein one -CH 2 - group may be replaced by cyclo-propylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclo-pentenylene, preferably by cyclopropylene or 1,3-cyclopentylene, alternatively R S1 alternatively, R S2 denotes X S X S denotes F, Cl, CN, NCS, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy or fluorinated alkenyloxy, the latter four groups preferably having 1 to 4, preferably 1 or 2, C atoms, preferably F, Cl, CF 3 or OCF 3, more preferably F, CF 3 or OCF 3, most preferably CF 3 or OCF 3, and Y S1 and Y S2, independently of one another, denote H or F, preferably one of them, most preferably both of them denote F, and R L1 and R L2, independently of one another, denote alkyl, alkoxy, preferably having 1 o 7 C atoms, wherein one -CH 2 -group may be replaced by cyclo-propylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclo-pentenylene, preferably by cyclopropylene or 1,3-cyclopentylene, alkenyl or alkenyloxy, alkoxyalkyl and preferably alkyl or alkenyl, wherein one -CH 2 -group may be replaced by cyclo-propylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclo-pentenylene, preferably by cyclopropylene or 1,3-cyclopentylene, alternatively R L1 denotes fluorinated alkyl or fluorinated alkoxy, preferably having 1 o 7 C atoms, or fluorinated alkenyl having 2 to 7 C atoms, X L denotes F, Cl, CN, NCS, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy or fluorinated alkenyloxy, the latter four groups preferably having 1 to 4, preferably 1 or 2, C atoms, preferably F, Cl, CF 3 or OCF 3, more preferably F, CF 3 or OCF 3, more preferably CF 3 or OCF 3, most preferably CF 3, and Y L1 and Y L2, independently of one another, denote H or F, preferably one of them, most preferably both of them denote H, and