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From my investigations, it's not iOS 9 at fault, but Xcode 7.0 beta 4.

If I build the app using Xcode 7.0 beta 4, then the cell separators are shown even when set to None in Interface Builder. If I build the same code with Xcode 6.4 or 7.0 beta 3, the separators are not shown.

You can explicitly call this in your ViewController as a workaround:

self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
(I guess ibtool may be at fault)
                In My case I am loading UITableview from the Code building with xcode 6.4 still I am getting this issue.
– Piyush Hirpara
                Aug 4, 2015 at 8:43
                I get the problem in my current projet although I build a tableView and its properties programmatically. Therefore ibtool might be at fault, but he's not the only guilty actor :)
– Jean Le Moignan
                Sep 17, 2015 at 20:25
                Do you mean after or in each reloadData call?  I had a similar experience where I had to add additional calls to set the separator and the background colors to get tables to appear correctly.
– Fiid
                Sep 26, 2015 at 15:33
Setting the separator style to .None didn't work for me, so I used the edge insets as a hack workaround
self.tableView.separatorInset.left = UIScreen.mainScreen().bounds.width
                YESSSSS. The only solution that also works when there are not enough cells to fill the tableview.
– Jean Le Moignan
                Sep 18, 2015 at 12:21
I had the same issue, worked fine on iOS 8 but show the separator in iOS9. I was setting the separator style to none already. The following resolved it for me 
if ([cell respondsToSelector:@selector(setPreservesSuperviewLayoutMargins:)]) {
        cell.preservesSuperviewLayoutMargins = NO;
    cell.separatorInset = UIEdgeInsetsMake(0.f, 0.f, 0.f, cell.bounds.size.width);
    if([cell respondsToSelector:@selector(setLayoutMargins:)]) {
        cell.layoutMargins = UIEdgeInsetsZero;
This basically squash the separator using the inset.
This issue is quite annoying. And here is my solution:
override func didMoveToSuperview() {
    if self.superview != nil {
        self.tableView.separatorStyle = .None
Set the separatorStyle again when view is added to its superview.
        
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