Okkazionalizm (az lotini ossa- sio, occasionis — hodisa, bahona), raviyai falsafai asri 17-i Evropai Fapbi, ki masalai tanosubi ruhu jismro (falsafai dualistii R. Dekart ba miyon guzoshta bud) ba tavri idealisti hal menamud. Namoyandagonash I. Klouberg, A. Geylinks, N. Malbrayash budand.
Notavonii dualizmi dekartchigi dar tabiri tasiri ruh ba jism va baraks hamchun asosi Okkazionalizm khizmat namud (Okkazionalizm qatiyan nomumkin budani tasiri ruhro ba jism tasdiq mekard). Okkazionalizm tasiri mutaqobilai ruhu jismro natijai «mujizai» dakholati muttasilu bevositai khudo ba dar yak hodisai alohida medonist.
Takmili idealistii dekartchigiro Malbransh ba itmom rasond, ki imkonnopazirii na tanho tasiri jism ba ruh, balki jism ba jismro tasdiq mekard. Dar falsafai G. Leybnis Okkazionalizm (dar talimot oid ba muvozinatn azali) takmil doda shudaast.