Bug introduced in 10.0.0 and fixed in 10.1.0 Update: It seems that only versions 10.0.0, 10.0.1, and 10.0.2 are affected by this problem. For 10.0.0 there is no general solution known to me due to Why does GridLines option fail with Function? For versions 10.0.1 and 10.0.2 a solution is the PlotTheme method in my self-answer . (The enhanced definition in that answer may still be of general interest.) In version 10.1.0 and later both GridLines -> All and GridLines -> Full produce the desired result, as shown in pmsoltani's now Accepted answer . In Version 7 using GridLines -> Automatic (or All ) would put a grid line at every log-spaced tick mark: LogPlot[x^x, {x, 1, 5}, GridLinesStyle -> LightGray, GridLines -> Automatic, Frame -> True] In Version 10 this is no longer the case: What is the simplest way to recover the old behavior? Answer You can, also, use GridLines -> Full option (in version 10.3, at least): LogPlot[x^x, {x, 1, 5}, GridLinesStyle -&