Liquid crystal medium comprising one or more compounds of formula I, R 11 -A 11 -A 12 -(CH 2) s -A 13 -A 14 -R 12 I in a concentration of up to 30% or less, and one or more compounds of formula II, R 21 -A 21 -A 22 -(A 23) u -Z 21 -(CH 2) t -Z 22 -A 24 -A 25 -A 26 -R 22 II in a concentration of 25% or more, wherein R 11 to R 22 are each independently H, F, Cl, CN, NCS or a straight-chain or branched alkyl group, which may be unsubstituted, mono- or polysubstituted by halogen or CN, it being also possible for one or more non-adjacent CH 2 groups to be replaced, in each occurrence independently from one another, by -O-, -S-, -NH-, -N(CH 3)-, -CO-, -COO-, -OCO-, -O-CO-O-, -S-CO-, -CO-S-, -CH=CH-, -CH=CF-, -CF=CF- or -C≡C- in such a manner that oxygen atoms are not linked directly to one another, A 11 to A 26, are each independently in each occurrence 1,4-phenylene, wherein in addition one or more CH groups may be replaced by N, trans-1,4-cyclohexylene in which, in addition, one or two non-adjacent CH 2 groups may be replaced by O and/or S, 1,4-cyclohexenylene, 1,4-bicyclo-(2,2,2)-octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl, 1,2,3,4-tetrahydro-naphthalene2,6-diyl, cyclobutane-1,3-diyl, spiro[3.3]heptane-2,6-diyl or dispiro[3.1.3.1]decane-2,8-diyl, it being possible for all these groups to be unsubstituted, mono-, di-, tri- or tetrasubstituted with F, Cl, CN or alkyl, alkoxy, alkylcarbonyl or alkoxycarbonyl groups, wherein one or more H atoms may be substituted by F or CI, Z 21 and Z 22 are each independently in each occurrence, -COO-, -OCO-, -O-CO-O-, -OCH 2 -, -CH 2 O-, -OCF 2 -, -CF 2 O-, -CH 2 CH 2 -, -(CH 2) 4 -, -CF 2 CF 2 -, -CH=CH-, -CF=CF-, -CH=CH-COO-, -OCO-CH=CH- or -C≡C-, optionally substituted with one or more of F, S and/or Si, s and t denotes an integer from 1 to 15, and u denotes 0 or 1. R 11 to R 22 are each independently H, F, Cl, CN, NCS or a straight-chain or branched alkyl group, which may be unsubstituted, mono- or polysubstituted by halogen or CN, it being also possible for one or more non-adjacent CH 2 groups to be replaced, in each occurrence independently from one another, by -O-, -S-, -NH-, -N(CH 3)-, -CO-, -COO-, -OCO-, -O-CO-O-, -S-CO-, -CO-S-, -CH=CH-, -CH=CF-, -CF=CF- or -C≡C- in such a manner that oxygen atoms are not linked directly to one another, A 11 to A 26, are each independently in each occurrence 1,4-phenylene, wherein in addition one or more CH groups may be replaced by N, trans-1,4-cyclohexylene in which, in addition, one or two non-adjacent CH 2 groups may be replaced by O and/or S, 1,4-cyclohexenylene, 1,4-bicyclo-(2,2,2)-octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl, 1,2,3,4-tetrahydro-naphthalene2,6-diyl, cyclobutane-1,3-diyl, spiro[3.3]heptane-2,6-diyl or dispiro[3.1.3.1]decane-2,8-diyl, it being possible for all these groups to be unsubstituted, mono-, di-, tri- or tetrasubstituted with F, Cl, CN or alkyl, alkoxy, alkylcarbonyl or alkoxycarbonyl groups, wherein one or more H atoms may be substituted by F or CI, Z 21 and Z 22 are each independently in each occurrence, -COO-, -OCO-, -O-CO-O-, -OCH 2 -, -CH 2 O-, -OCF 2 -, -CF 2 O-, -CH 2 CH 2 -, -(CH 2) 4 -, -CF 2 CF 2 -, -CH=CH-, -CF=CF-, -CH=CH-COO-, -OCO-CH=CH- or -C≡C-, optionally substituted with one or more of F, S and/or Si, s and t denotes an integer from 1 to 15, and u denotes 0 or 1.