Musim keempat How I Met Your Mother, sitkom Amerika Serikat yang diciptakan oleh Carter Bays dan Craig Thomas, tayang perdana di CBS di Amerika Serikat pada tanggal 22 September 2008 dan berakhir tanggal 18 Mei 2009. Musim ini terdiri dari 24 episode yang masing-masing berdurasi sekitar 22 menit. CBS menyiarkan musim keempat pada Senin malam pukul 20:30. Musim keempat disiarkan di E4 di Britania Raya pada 10 Desember 2009 dan dirilis dalam bentuk DVD di Region 1 tanggal 29 September 2009.
Sampai saat ini, musim keempat adalah satu-satunya musim dalam seri ini yang masuk nominasi Primetime Emmy Award for Outstanding Comedy Series.[1]
This season is currently the second highest rated season of How I Met Your Mother in terms of viewership, at an average of 9.42 million viewers.[26] However, it is currently the highest rated in terms of the important Adults 18-49 demographic, which is what advertisers use to determine how much a 30-second advertising spot costs. Season 4 averaged 4.0/10 in terms of rating/share in the Adults 18-49 demographic.
Michelle Zoromski of IGN gave Season 4 an overall rating of 8.5 out of 10. Michelle stated, "This fourth season seemed to settle down the chase for the tituler mother. While Ted was busy dating Stella, the gang settled into many stand alone episodes which were every bit as entertaining as episodes devoted to Ted's love life," later going on to say, "A stellar Robin-Marshall episode, titled "Little Minnesota," makes it clear that these two do not get enough screen time together. With Robin homesick and unemployed (and at risk of being deported), this pairing brought out the best Robin Sparkles reference of the season, when Marshall leads a rousing karaoke version of "Let's Go to the Mall!"[27]
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