Dark matter (DM) particle annihilation or decay can produce monochromatic $gamma$-rays readily distinguishable from astrophysical sources. $gamma$-ray line limits from 30 GeV to 200 GeV obtained from 11 months of Fermi Large Area Space Telescope data from 20-300 GeV are presented using a selection based on requirements for a $gamma$-ray line analysis, and integrated over most of the sky. We obtain $gamma$-ray line flux upper limits in the range $0.6-4.5times 10^{-9}mathrm{cm}^{-2}mathrm{s}^{-1}$, and give corresponding DM annihilation cross-section and decay lifetime limits. Theoretical implications are briefly discussed.
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