Eastern European Outreach UK (EEO UK) is an interdenominational Christian mission founded in 1984 in partnership with OostEuropa Zending Netherlands (OEZ NL). The organisation conducts many of its national and international activities together with Eastern European Outreach International (EEO Intl.)

 The goal of EEO UK is to spread the Gospel of Jesus throughout the world  by direct evangelism and a wide scale of care projects. This is achieved specifically through the Child Sponsors Programme and care projects and by providing children's, medical and prisoner relief aid, together with transport of such aid and support for those suffering human rights abuse.

 EEO Intl. was  one of many missions born out of the spiritual awakening in Holland through the crusades of Evangelist T.L.Osborn, in 1958/59. The organisation came into being in 1967 through Dutch founder, Kees van Olst, who, as a young man, had smuggled Bibles into eastern Europe.  An English Evangelist had introduced him to the Underground Church in Czechoslovakia.

From this time, spiritual and material relief was directed to the Persecuted Church  from Kees' base in Vienna. Soon EEO Intl. developed to provide valuable aid to nations such as Albania, Ukraine, Romania and Bulgaria in the 1980s, including clothing and food parcels,  also supporting families struggling for survival.