• The American Journal of Physics (US, AAPT)

• Astronomy Education Review (US, AAS)

• The Physical Review: Physics Education Research (US, APS)

• Physics Education (UK, IOP)

• Journal of Physics Teacher Education Online (Illinois State U, US)

• The Physics Teacher (US, AAPT)

• arXiv (on-line preprint archive)

• Physics Education (India)

• Physics Education in University -- in Japanese (Japan, JPS)

Journals in science education

• Journal of Research in Science Teaching (US, NARST)

• International Journal of Science Education (UK, Routledge)

• Cognition and Instruction (US, Lawrence Erlbaum)

• Journal of College Science Teaching (NSTA)

• Journal of Computers in Mathematics and Science Teaching (US, AACE)

• Journal of Chemical Education (ACS)

• ERIC (The Education Resources Information Center) --
  A huge database of education research papers including many
  conference papers and preprints unpublished elsewhere

Journals in related areas of interest

• Journal for Research in Mathematics Education (NCTM)

• Journal of Engineering Education (ASEE)

• The International Journal of Engineering Education

• Annals of Research in Engineering Education: An online collector of articles in many journals relevant for engineering education