Liquid-crystalline medium having negative dielectric anisotropy, characterised in that it comprises one or more dichroic dyes, one or more compounds of the formula I, wherein R 1 denotes alkyl or alkenyl having up to 12 C atoms, wherein one or more non adjacent CH 2 groups may be replaced by -O- and/or a cycloalkyl ring having 3 to 5 C atoms, and wherein one or more H atoms may be replaced by F, A 1 on each occurrence, identically or differently, denotes (a) a trans-1,4-cyclohexylene radical, in which one or more non-adjacent CH 2 groups may be replaced by -O- and/or -S-, (b) a 1,4-phenylene radical, in which one or two CH groups may be replaced by N, (c) trans-1,4-cyclohexenylene, (d) a radical from the group consisting of 1,4-bicyclo[2.2.2]octylene, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthalene-2,6-diyl, where the radicals (a) to (d) may be substituted by one or two fluorine atoms, Z 1 on each occurrence, independently of one another, denotes -CO-O-, -O-CO-, -CH 2 O-, -OCH 2 -, -CH 2 CH 2 -, -CH=CH-, -C≡C-, -(CH 2) 4 -, -OCF 2 -, -CF 2 O-, -CF 2 CF 2 -, or a single bond, L 11, L 12, L 13 and L 14 each, independently of one another, denote H, CI, or F, n is 1, 2 or 3; and one or more compounds selected from the group of the compounds of the formulae IIA, IIB and IIC, in which R 2A, R 2B each, independently of one another, denote H, an alkyl or alkenyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF 3 or at least monosubstituted by halogen, where, in addition, one or more CH 2 groups in these radicals may be replaced by -O-, -S-, -C≡C-, -CF 2 O-, -OCF 2 -, -OC-O- or -O-CO- in such a way that O atoms are not linked directly to one another, or a cycloalkyl ring having 3 to 6 C atoms, R 2C denotes an alkyl radical having 1 to 6 C atoms, L 1-4 each, independently of one another, denote F, Cl, CF 3 or CHF 2, Z 2 and Z 2' each, independently of one another, denote a single bond, -CH 2 CH 2 - or -CH 2 O-, p denotes 1 or 2, q denotes 0 or 1, and v denotes 1 to 6. R 1 denotes alkyl or alkenyl having up to 12 C atoms, wherein one or more non adjacent CH 2 groups may be replaced by -O- and/or a cycloalkyl ring having 3 to 5 C atoms, and wherein one or more H atoms may be replaced by F, A 1 on each occurrence, identically or differently, denotes (a) a trans-1,4-cyclohexylene radical, in which one or more non-adjacent CH 2 groups may be replaced by -O- and/or -S-, (b) a 1,4-phenylene radical, in which one or two CH groups may be replaced by N, (c) trans-1,4-cyclohexenylene, (d) a radical from the group consisting of 1,4-bicyclo[2.2.2]octylene, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthalene-2,6-diyl, where the radicals (a) to (d) may be substituted by one or two fluorine atoms, (a) a trans-1,4-cyclohexylene radical, in which one or more non-adjacent CH 2 groups may be replaced by -O- and/or -S-, (b) a 1,4-phenylene radical, in which one or two CH groups may be replaced by N, (c) trans-1,4-cyclohexenylene, (d) a radical from the group consisting of 1,4-bicyclo[2.2.2]octylene, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthalene-2,6-diyl, Z 1 on each occurrence, independently of one another, denotes -CO-O-, -O-CO-, -CH 2 O-, -OCH 2 -, -CH 2 CH 2 -, -CH=CH-, -C≡C-, -(CH 2) 4 -, -OCF 2 -, -CF 2 O-, -CF 2 CF 2 -, or a single bond, L 11, L 12, L 13 and L 14 each, independently of one another, denote H, CI, or F, n is 1, 2 or 3; R 2A, R 2B each, independently of one another, denote H, an alkyl or alkenyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF 3 or at least monosubstituted by halogen, where, in addition, one or more CH 2 groups in these radicals may be replaced by -O-, -S-, -C≡C-, -CF 2 O-, -OCF 2 -, -OC-O- or -O-CO- in such a way that O atoms are not linked directly to one another, or a cycloalkyl ring having 3 to 6 C atoms, R 2C denotes an alkyl radical having 1 to 6 C atoms, L 1-4 each, independently of one another, denote F, Cl, CF 3 or CHF 2, Z 2 and Z 2' each, independently of one another, denote a single bond, -CH 2 CH 2 - or -CH 2 O-, p denotes 1 or 2, q denotes 0 or 1, and v denotes 1 to 6.