Vainikai is a village in Kėdainiai district municipality, in Kaunas County, in central Lithuania. According to the 2011 census, the village had a population of 283 people. It is located 4.5 kilometres (2.8 mi) from Josvainiai, on the right bank of the Nevėžis river by the Upytė river mouth. There are former school, medicine station.

Vainikai has been established in the former lands of the Karūnava estate during the Interwar. In the Soviet era it was a poultry sovkhoz center.

Historical population

Year Pop. ±% p.a. 1923 334 —     1959 163 −1.97% 1970 191 +1.45% 1979 315 +5.72%	Year Pop. ±% p.a. 1987 288 −1.11% 1989 327 +6.56% 2001 365 +0.92% 2011 283 −2.51%
Source: 1902, 1923, 1959 & 1970, 1979, 1989, 2001, 2011