Samuel Ireri Gathimba (born 26 October 1987 in Nyeri County) is a Kenyan racewalking athlete.

He was the 20 kilometres walk gold medallist at the African Championships in Athletics in 2016.

Gathimba emerged at international level in 2014, taking a silver medal at the 2014 African Championships in Athletics behind Lebogang Shange of South Africa.

He set a personal best of 1:23:59 hours to place second at the national championships that year, behind David Kimutai Rotich.

[3][4] He again demonstrated his place among the continent's best at the 2015 African Games where he lost out on the gold to Shange by a margin of one second.