The Interior of the Lexus GS are as follow:
| Variants | 2018 Lexus GS GS 300 F Sport | 2018 Lexus GS GS 300 Luxury | 2018 Lexus GS GS 300 Premium | 2018 Lexus GS GS 300h | 2018 Lexus GS GS 350 F Sport | 2018 Lexus GS GS 350 Luxury |
| Sunroof | - | - | - | Yes | - | - |
| Sunshade | Powered rear sun shade | Powered rear sun shade, manual rear door window shades | - | Powered rear sun shade, manual rear door window shades | Powered rear sun shade | Powered rear sun shade, manual rear door window shades |
| Seat Features(Front-Driver) | 16-Way Power-Adjustable Seats with Memory Function | 18-Way Power-Adjustable Seats with Memory Function | 10-Way Power-Adjustable Seat with Memory Function | 18-Way Power-Adjustable Seats with Memory Function | 16-Way Power-Adjustable Seats with Memory Function | 18-Way Power-Adjustable Seats with Memory Function |
| Seat Features(Passenger) | 16-Way Power-Adjustable Seats | 10-Way Power-Adjustable Seats | ||||
| Seat Features(Rear) | Fold-down Centre Armrest | Fold-down Centre Armrest with Audio and Air-con Controls | Fold-down Centre Armrest | Fold-down Centre Armrest with Audio and Air-con Controls | Fold-down Centre Armrest | Fold-down Centre Armrest with Audio and Air-con Controls |
| Cupholders | 2 Front, 2 Rear | 2 Front, 2 Rear | 2 Front, 2 Rear | 2 Front, 2 Rear | 2 Front, 2 Rear | 2 Front, 2 Rear |
| Front Air-con | Dual-zone Automatic Climate Control System | Dual-zone Automatic Climate Control System | Dual-zone Automatic Climate Control System | Dual-zone Automatic Climate Control System | Dual-zone Automatic Climate Control System | Dual-zone Automatic Climate Control System |
| Rear Air-con | Y | Y | Y | Y | Y | Y |
| Paddle Shift | Y | Y | Y | Y | Y | Y |
| Multi-function Steering Wheel | Y | Y | Y | Y | Y | Y |
| Steering Tilt | Y | Y | Y | Y | Y | Y |
| Steering Telescopic | Y | Y | Y | Y | Y | Y |
| Steering Adjustment Electric | Y | Y | Y | Y | Y | Y |
| Engine Start | Keyless Push Button | Keyless Push Button | Keyless Push Button | Keyless Push Button | Keyless Push Button | Keyless Push Button |
| Head-up Display | - | - | - | Y | - | - |
