Léopold Guillaume Gillekens (11 October 1833, Sint-Pieters-Leeuw – 2 October 1905, Vilvoorde) was a Belgian horticulturalist.Gillekens is known for his work in the fields of pomology and arboriculture.
From 1867, he served as director of the Ecole d'horticulture de l'Etat à Vilvorde.
He was publisher of the journal Moniteur horticole belge.