A liquid crystal medium comprising one or more compounds of formula I in which R 1 denotes H, a straight chain or branched alkyl or alkoxy radical having 1 to 15 C atoms, where one or more CH 2 groups in these radicals may each be replaced, independently of one another, by -C≡C-, -CF 2 O-, -OCF 2 -, -CH=CH-, -O-, -CO-O- or -O-CO- in such a way that O atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by halogen, denotes or Y 1 denotes H or CH 3, n is 0 or 1, v is 1, 2, 3, 4, 5, or 6; and one or more compounds selected from the group of compounds of the formulae IIA, IIB, IIC and IID, in which R 2A, R 2B, R 2C and R 2D 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, L 1 to L 4 each, independently of one another, denote F, Cl, CF 3 or CHF 2, Y denotes H, F, Cl, CF 3, CHF 2 or CH 3, Z 2, Z 2B and Z 2D each, independently of one another, denote a single bond, -CH 2 CH 2 -, -CH=CH-, -CF 2 O-, -OCF 2 -, -CH 2 O-, -OCH 2 -, -COO-, -OCO-, -C 2 F 4 -, -CF=CF- or -CH=CHCH 2 O-, p denotes 0, 1 or 2, q denotes 0 or 1, and v denotes an integer from 1 to 6, wherein the compounds of formula I are excluded from formula IID, and the medium further comprising one or more compounds of formula IV in which R 41 denotes alkyl having 1 to 7 C atoms or alkenyl having 2 to 7 C atoms, and R 42 denotes alkyl having 1 to 7 C atoms or alkoxy having 1 to 6 C atoms or alkenyl having 2 to 7 C atoms, wherein the total concentration of the compounds of the formulae I and IV is in the range of from 35% to 75% by weight. R 1 denotes H, a straight chain or branched alkyl or alkoxy radical having 1 to 15 C atoms, where one or more CH 2 groups in these radicals may each be replaced, independently of one another, by -C≡C-, -CF 2 O-, -OCF 2 -, -CH=CH-, -O-, -CO-O- or -O-CO- in such a way that O atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by halogen, denotes or Y 1 denotes H or CH 3, n is 0 or 1, v is 1, 2, 3, 4, 5, or 6; and one or more compounds selected from the group of compounds of the formulae IIA, IIB, IIC and IID, in which R 2A, R 2B, R 2C and R 2D 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, L 1 to L 4 each, independently of one another, denote F, Cl, CF 3 or CHF 2, Y denotes H, F, Cl, CF 3, CHF 2 or CH 3, Z 2, Z 2B and Z 2D each, independently of one another, denote a single bond, -CH 2 CH 2 -, -CH=CH-, -CF 2 O-, -OCF 2 -, -CH 2 O-, -OCH 2 -, -COO-, -OCO-, -C 2 F 4 -, -CF=CF- or -CH=CHCH 2 O-, p denotes 0, 1 or 2, q denotes 0 or 1, and v denotes an integer from 1 to 6, R 2A, R 2B, R 2C and R 2D 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, L 1 to L 4 each, independently of one another, denote F, Cl, CF 3 or CHF 2, Y denotes H, F, Cl, CF 3, CHF 2 or CH 3, Z 2, Z 2B and Z 2D each, independently of one another, denote a single bond, -CH 2 CH 2 -, -CH=CH-, -CF 2 O-, -OCF 2 -, -CH 2 O-, -OCH 2 -, -COO-, -OCO-, -C 2 F 4 -, -CF=CF- or -CH=CHCH 2 O-, p denotes 0, 1 or 2, q denotes 0 or 1, and v denotes an integer from 1 to 6, wherein the compounds of formula I are excluded from formula IID, and the medium further comprising one or more compounds of formula IV in which R 41 denotes alkyl having 1 to 7 C atoms or alkenyl having 2 to 7 C atoms, and R 42 denotes alkyl having 1 to 7 C atoms or alkoxy having 1 to 6 C atoms or alkenyl having 2 to 7 C atoms, R 41 denotes alkyl having 1 to 7 C atoms or alkenyl having 2 to 7 C atoms, and R 42 denotes alkyl having 1 to 7 C atoms or alkoxy having 1 to 6 C atoms or alkenyl having 2 to 7 C atoms, wherein the total concentration of the compounds of the formulae I and IV is in the range of from 35% to 75% by weight.