The T series is officially the flagship ThinkPad product, offering high-performance computers aimed at businesses and professionals.

Despite a 14.1-inch screen, similar to desktops at the time, the titanium composite body on the laptop was designed to keep the weight as low as possible.

[2] Users were also given options to swap components for mobility, like a DVD player, writeable CD drive or numeric keypads.

[3] With a weight of 2.1 kg (4.6 lb), the T20 was the lightest laptop offering with a screen size of 14.1-inch (360 mm).

[4] With the addition of an internal 8x DVD-ROM drive, the weight remained as low as 2.4 kg (5.2 lb).

[2] Further minor refinements were made to the T2X series resulting in the T22 and finally in 2002 with the T23 a Pentium III-M 1.13 GHz "Tualatin" having 128 MiB of RAM and a 30 GB hard drive.

[7] Additional options included the ATI Mobility Radeon 7500 video controller with 16 MiB graphics memory, a 14.1-inch LCD display with a resolution of 1400 × 1050, and 1 GiB PC2100 RAM.

[10] The ThinkPad T40p offered a Pentium M clocked at 1.3, 1.5, or 1.6 GHz, ATI Mobility Radeon 9000 with 64 MiB VRAM, a 14.1-inch LCD display with 1400 × 1050 resolution, a maximum of 2 GiB PC2100 RAM, and a 60 GB IDE hard disk.

[17] It also was the first T series model to adopt widescreen resolution as a mainstream option; the traditional 4:3 aspect ratio screens was also offered as an alternative at the time but mass industry adoption of the widescreen standard meant that it was the last ThinkPad of its kind to use the 4:3 standard.

[20] Designed as mobile workstations, the W series grew to become Lenovo's line of performance-oriented laptops.

In 2019 Lenovo officially introduced AMD CPUs in the T series, and differentiated it with the digit 5 at the end of the model number (i.e. T495).

From 2020 onwards, the naming scheme was changed again, with the letter "T" followed by the screen size in inches, then the generation number and the screen size and CPU manufacturer in brackets (e.g. T14s Gen 2 (14" Intel), T16 Gen 1 (16" AMD)), similar to the scheme used by the X1 series.

This line introduces a touchpad with no physical buttons on the top and bottom and latch-less cases on all models.

1920 × 1080 IPS multi-touch (on-cell) 3840 × 2160 IPS HDR400 Dolby Vision Nvidia GeForce RTX 2070 SUPER (8 GB GDDR6)or GeForce RTX 2080 SUPER (8 GB GDDR6) Intel Wi-Fi 6 AX201 (802.11ax 2x2 Wi-Fi + Bluetooth 5.2, M.2 Card) Optional WWAN Anti-glare:

1 × 3.5 mm TRRS combo audio jack 1 × SD card reader Model with Nvidia RTX GPUs known as P15v Gen 2.

1920 × 1080 IPS multi-touch (on-cell) 3840 × 2160 IPS HDR400 Dolby Vision i7-11800H i7-11850H i9-11950H Xeon W-11855M Nvidia GeForce RTX 3070 (8 GB GDDR6)or GeForce RTX 3080 (16 GB GDDR6) Intel Wi-Fi 6 AX210 (802.11ax 2x2 Wi-Fi + Bluetooth 5.1) Optional WWAN Anti-glare:

[105] WIRED also reviewed the T410 laptop positively, saying that “Lenovo's thoughtful ThinkPad is a near-perfect machine”.

[106] The PC Advisor review of the ThinkPad T510 called the lack of alterations to the traditional design a good thing.

[107] It also highlighted the professional appearance and ‘sturdy build quality’, indicating that this makes the laptop stand out from others in the market.