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 Construction is an everlasting activity across the globe. Likewise, the problem of delay in the construction industry is a global phenomenon. There are several reasons that may be responsible for delay during construction, these reasons  may vary from place to place and such delays can be reduced to the minimum when its causes are identified. This study considered the major causes and effects of delay in the execution of construction projects in Akure, Ondo State, Nigeria. Using literatures, a total number of 30 causes of construction delays were identified. Purposive sampling technique was used to select sixty respondents for the survey. The respondents comprise twenty-two (22) clients, eighteen consultants (18) and twenty (20) contractors. The analyses of the primary data revealed that the three most important causes of delay in construction projects in Akure, Ondo State Nigeria are poor site management and supervision, contractor inexperience and client’s financial difficulties. Based on the findings of this study, recommendations were given on how the causes and effects of delay in construction can be mitigated.