The Finnish national road 23 (Finnish: Valtatie 23, Swedish: Riksväg 23) is a highway between Western and Eastern Finland that runs between the cities of Pori and Joensuu via Jyväskylä.

The road is also called the Finnish Lake Road (Finnish: Järvi-Suomen tie, Swedish: Insjöfinlands vägen), as it runs through the Finnish Lakeland area in the central hinterland of the country.

[1] The road is almost entirely two-lane, except for the motorway section shared with Highways 4, 9 and 13 in the Jyväskylä sub-region, the short four-lane section located in the center of Varkaus and the motorway section common to Highway 9 in Joensuu.

The road has been built over decades in several different parts, and its quality varies significantly.

[2] The road passes through the following municipalities, localities in brackets: Pori-Pomarkku–Kankaanpää–Jämijärvi–Parkano–Ikaalinen–Parkano (again)–Kihniö–Virrat–Keuruu–Petäjävesi–Jyväskylä–Laukaa–Hankasalmi–Pieksämäki–Joroinen–Pieksämäki (again)–Joroinen (again)–Pieksämäki (again)–Joroinen (again)–Varkaus–Leppävirta–Heinävesi–Leppävirta (again)–Heinävesi (again)–Liperi–Joensuu.