• Biological Stain Commission - Quality control organization for biological dyes and stains. Publications, services, histology links, and protocols are provided.
• The Digital Microscope - Provides information on the digital microscope which has been developed at the LabCeTi at the University of Namur to provide educational material for medical faculties in emerging countries. Includes a wide range of images for histology and pathology.
• Histology on the WWW - Contains links to sites with images, protocols and techniques, and general histology resources.
• Histology World - Links, books, mnemonics and information about histology for undergraduate and graduate anatomy, medical, dental, and other health professional students. Includes reviews and recommendations.
• Histosearch - Provides a histology search engine which searches over 100 websites related to histology, including messages posted to the histology listserver, Histonet. A separate section searches the Histonet archives.
• Internet Atlas of Histology - More than 1000 labeled images, with descriptions, practice labs, and quizzes. Created by the UIUC College of Medicine.
• JayDoc HistoWeb - A comprehensive histology atlas from the Kansas University Medical Center.
• Laboratory of Histology and Embryology - Research focusing on histology, cell biology, microscopy, neurobiology, and stereology. From the University of Oporto, Portugal.
• LUMEN Histology - Lesson plans with slides and practicals for the Loyola University Medical Education Network histology course.
• Martindale's Health Science Guide: Anatomy & Histology Center - Histology section includes exams, courses, techniques and procedures, and tissue preservation resources.
• National Society for Histotechnology - Incorporated in 1974 for the purpose of advancing professional growth, standards, knowledge and performance of histotechnology through continuing and formal education programs.
• ProLab - Provides instruments and consumables for histology and pathology. English and German.
• University of Delaware Mammalian Histology - Course syllabus and class resources, including microscopic images, ultrastructural images, 3-D models, and labelled diagrams.
• University of Pennsylvania Histology Homepage - Slides arranged by tissue or organ types, for non-human mammals and birds. From School of Veterinary Medicine.
• Vanderbilt University Medical School Cell and Tissue Biology - Lesson plans for blood, epithelium, nervous tissues, salivary glands, and exocrine pancreas tissues.
• Visual Histology - Offers a 26 program DVD video course covering all aspects of basic histology. Each program is 30 minutes long with a lecture, lab, and final exam. A free histology text atlas is available online.

Other links and resources here.