diff --git a/R-package/R/lgb.Dataset.R b/R-package/R/lgb.Dataset.R
index 5c7071ffafc9..292701bd9d24 100644
--- a/R-package/R/lgb.Dataset.R
+++ b/R-package/R/lgb.Dataset.R
@@ -500,6 +500,16 @@ Dataset <- R6::R6Class(
     # Slice dataset
     slice = function(idxset, ...) {
 
+      additional_params <- list(...)
+      if (length(additional_params) > 0L) {
+        warning(paste0(
+          "Dataset$slice(): Found the following passed through '...': "
+          , paste(names(additional_params), collapse = ", ")
+          , ". These are ignored and should be removed. "
+          , "In future releases of lightgbm, this warning will become an error."
+        ))
+      }
+
       # Perform slicing
       return(
         Dataset$new(