The following worksheets contain many different types of exercises to teach your students alphabetical order. Sheets may focus on just letters or entire words. One worksheet asks students to supply their own words which fall between two given words, and would be great to pair with learning how to use a dictionary. Note: Some of the vocabulary may be too advanced for your students, but they only need to put them in alphabetical order, not define them.
Fun Fact: Primers that tell stories or recite poems using subjects that begin with each letter in alphabetical order are called abecedaries.