Liquid-crystalline medium comprising one or more compounds of formula A and, in addition one or more compounds selected from the group of compounds of formulae I and II wherein R 01 and R 02 each, independently of one another, denote a halo-genated or unsubstituted alkyl radical having 1 to 15 C atoms, wherein one or more CH 2 groups in these radicals may be replaced, independently of one another, by -C≡C-, -CH=CH-, -CF=CF-, -CF=CH-, -CH=CF-, - O-, -O -, - -, -O- or -S- in such a way that O or S atoms are not linked directly to one another, L 01 and L 02 denote H or CH 3 with the proviso that one of L 01 and L 02 denotes H and the other of L 01 and L 02 denotes CH 3, denotes L 11 denotes alkyl having 1 to 6 C atoms, cycloalkyl having 3 to 6 C atoms or cycloalkenyl having 4 to 6 C atoms, X 11 denotes H, alkyl having 1 to 3 C atoms or halogen, R 11 to R 14 independently of one another, denote unfluorinated alkyl or unfluorinated alkoxy, each having 1 to 15 C atoms, unfluorinated alkenyl, unfluorinated alkenyloxy or unfluorinated alkoxyalkyl, each having 2 to 15 C atoms, or cycloalkyl, alkylcycloalkyl, cycloalkenyl, alkylcycloalkenyl, alkylcycloalkylalkyl or alkylcyclo-alkenylalkyl, each having up to 15 C atoms, and alternatively one of R 13 and R 14 or both also denote H; L 21 denotes R 21 and, in the case where Z 21 and/or Z 22 denote trans -CH=CH- or trans -CF=CF-, alternatively also denotes X 21, L 22 denotes R 22 and, in the case where Z 21 and/or Z 22 denote trans -CH=CH- or trans -CF=CF-, alternatively also denotes X 22, R 21 and R 22 independently of one another, denote H, unfluorinated alkyl or unfluorinated alkoxy having 1 to 17 C atoms or unfluorinated alkenyl, unfluorinated alkenyloxy or unfluorinated alkoxyalkyl having 2 to 15 C atoms, X 21 and X 22 independently of one another, denote F or Cl, -CN,-NCS, -SF 5, fluorinated alkyl or alkoxy having 1 to 7 C atoms or fluorinated alkenyl, alkenyloxy or alkoxyalkyl having 2 to 7 C atoms, one of Z 21 and Z 22 denotes trans- CH=CH -, trans-CF=CF- or -C=C- and the other, independently thereof, denotes trans -CH=CH-, trans -CF=CF- or a single bond, and independently of one another, denote R 01 and R 02 each, independently of one another, denote a halo-genated or unsubstituted alkyl radical having 1 to 15 C atoms, wherein one or more CH 2 groups in these radicals may be replaced, independently of one another, by -C≡C-, -CH=CH-, -CF=CF-, -CF=CH-, -CH=CF-, - O-, -O -, - -, -O- or -S- in such a way that O or S atoms are not linked directly to one another, L 01 and L 02 denote H or CH 3 with the proviso that one of L 01 and L 02 denotes H and the other of L 01 and L 02 denotes CH 3, denotes L 11 denotes alkyl having 1 to 6 C atoms, cycloalkyl having 3 to 6 C atoms or cycloalkenyl having 4 to 6 C atoms, X 11 denotes H, alkyl having 1 to 3 C atoms or halogen, R 11 to R 14 independently of one another, denote unfluorinated alkyl or unfluorinated alkoxy, each having 1 to 15 C atoms, unfluorinated alkenyl, unfluorinated alkenyloxy or unfluorinated alkoxyalkyl, each having 2 to 15 C atoms, or cycloalkyl, alkylcycloalkyl, cycloalkenyl, alkylcycloalkenyl, alkylcycloalkylalkyl or alkylcyclo-alkenylalkyl, each having up to 15 C atoms, and alternatively one of R 13 and R 14 or both also denote H; L 21 denotes R 21 and, in the case where Z 21 and/or Z 22 denote trans -CH=CH- or trans -CF=CF-, alternatively also denotes X 21, L 22 denotes R 22 and, in the case where Z 21 and/or Z 22 denote trans -CH=CH- or trans -CF=CF-, alternatively also denotes X 22, R 21 and R 22 independently of one another, denote H, unfluorinated alkyl or unfluorinated alkoxy having 1 to 17 C atoms or unfluorinated alkenyl, unfluorinated alkenyloxy or unfluorinated alkoxyalkyl having 2 to 15 C atoms, X 21 and X 22 independently of one another, denote F or Cl, -CN,-NCS, -SF 5, fluorinated alkyl or alkoxy having 1 to 7 C atoms or fluorinated alkenyl, alkenyloxy or alkoxyalkyl having 2 to 7 C atoms, one of Z 21 and Z 22 denotes trans- CH=CH -, trans-CF=CF- or -C=C- and the other, independently thereof, denotes trans -CH=CH-, trans -CF=CF- or a single bond, and independently of one another, denote